Carry Flag - Revision history

Mr z: Protected "Carry Flag" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

2010-12-04T08:12:22Z

Protected "Carry Flag" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))

Mr z at 00:34, 12 January 2005

2005-01-12T00:34:54Z

Mr z at 23:43, 11 January 2005

2005-01-11T23:43:45Z

Mr z at 23:38, 11 January 2005

2005-01-11T23:38:45Z

Pingaso at 20:55, 11 January 2005

2005-01-11T20:55:53Z

Pingaso at 20:55, 11 January 2005

2005-01-11T20:55:43Z

Pingaso at 20:55, 11 January 2005

2005-01-11T20:55:17Z

Pingaso at 20:55, 11 January 2005

2005-01-11T20:55:07Z

Pingaso at 20:54, 11 January 2005

2005-01-11T20:54:11Z

Pingaso at 20:53, 11 January 2005

2005-01-11T20:53:53Z

@@ Line 2: / Line 2: @@
 The Carry Flag (C), if set, indicates that the previous operation resulted in an unsigned integer overflow.  If clear, the previous operation did not result in an unsigned integer overflow.<br/><br/>
-For unsigned addition, the Carry is set when the addition's result is larger than what would fit in a 16-bit register, and cleared otherwise.  For unsigned subtraction, the Carry is set whenever the minuend (the first number) is greater than or equal to the subtrahend (the second number), and cleared otherwise.  (In essence, it indicates "Did Not Borrow.")  The Carry bit can be used in conjunction with ADCR to perform [[Extended Precision Arithmetic]].<br/><br/>
+For unsigned addition, the Carry is set when the addition's result is larger than what would fit in a 16-bit register, and cleared otherwise.  For unsigned subtraction, the Carry is set whenever the minuend (the number being subtracted from) is greater than or equal to the subtrahend (the number being subtracted), and cleared otherwise.  (In essence, it indicates "Did Not Borrow.")  The Carry bit can be used in conjunction with ADCR to perform [[Extended Precision Arithmetic]].<br/><br/>
 Since the CMP family of instructions compare numbers by subtracting them, one sometimes sees [[BC|Branch if Carry set]] described as an unsigned variation of "Branch if Greater-than or Equal"  (also BHIS: Branch if HIgher or Same), and [[BNC|Branch if No Carry set]] described as an unsigned variation of "Branch if Less-than" (also BLO:  Branch if LOwer).  The names BHIS and BLO come from the PDP-11.<br/><br/>

@@ Line 2: / Line 2: @@
 The Carry Flag (C), if set, indicates that the previous operation resulted in an unsigned integer overflow.  If clear, the previous operation did not result in an unsigned integer overflow.<br/><br/>
-For unsigned addition, the Carry is set when the addition's result is larger than what would fit in a 16-bit register, and cleared otherwise.  For unsigned subtraction, the Carry is set whenever the minuend (the first number) is greater than or equal to the subtrahend (the second number), and cleared otherwise.  (In essence, it indicates "Did Not Borrow.")  Since the CMP family of instructions compare numbers by subtracting them, one sometimes sees [[BC|Branch if Carry set]] described as an unsigned variation of "Branch if Greater-than or Equal"  (sometimes seen as BHIS: Branch if HIgher or Same), and [[BNC|Branch if No Carry set]] described as an unsigned variation of "Branch if Less-than" (sometimes seen as BLO:  Branch if LOwer).<br/><br/>
+For unsigned addition, the Carry is set when the addition's result is larger than what would fit in a 16-bit register, and cleared otherwise.  For unsigned subtraction, the Carry is set whenever the minuend (the first number) is greater than or equal to the subtrahend (the second number), and cleared otherwise.  (In essence, it indicates "Did Not Borrow.")  The Carry bit can be used in conjunction with ADCR to perform [[Extended Precision Arithmetic]].<br/><br/>
 The behavior of the following opcodes is affected by the status of the Carry Flag.<br/>

@@ Line 1: / Line 1: @@
 [[Category:CP1610]]
-The Carry Flag (C), if set, indicates that the previous operation resulted in an unsigned integer overflow or underflow.  If clear, the previous operation did not result in an unsigned overflow or underflow. For example, during the process of arithmetic addition, an unsigned overflow can occur when two positive signed integers are added together and results in a third positive signed integer that is too large to contain in a single 16-bit register.<br/><br/>
+The Carry Flag (C), if set, indicates that the previous operation resulted in an unsigned integer overflow.  If clear, the previous operation did not result in an unsigned integer overflow.<br/><br/>
 The behavior of the following opcodes is affected by the status of the Carry Flag.<br/>

← Older revision		Revision as of 20:55, 11 January 2005
Line 1:		Line 1:
−	[[Category:CP1610]	+	[[Category:CP1610]]
	The Carry Flag (C), if set, indicates that the previous operation resulted in an unsigned integer overflow or underflow. If clear, the previous operation did not result in an unsigned overflow or underflow. For example, during the process of arithmetic addition, an unsigned overflow can occur when two positive signed integers are added together and results in a third positive signed integer that is too large to contain in a single 16-bit register.<br/><br/>		The Carry Flag (C), if set, indicates that the previous operation resulted in an unsigned integer overflow or underflow. If clear, the previous operation did not result in an unsigned overflow or underflow. For example, during the process of arithmetic addition, an unsigned overflow can occur when two positive signed integers are added together and results in a third positive signed integer that is too large to contain in a single 16-bit register.<br/><br/>

← Older revision		Revision as of 20:55, 11 January 2005
Line 1:		Line 1:
		+	[[Category:CP1610]
	The Carry Flag (C), if set, indicates that the previous operation resulted in an unsigned integer overflow or underflow. If clear, the previous operation did not result in an unsigned overflow or underflow. For example, during the process of arithmetic addition, an unsigned overflow can occur when two positive signed integers are added together and results in a third positive signed integer that is too large to contain in a single 16-bit register.<br/><br/>		The Carry Flag (C), if set, indicates that the previous operation resulted in an unsigned integer overflow or underflow. If clear, the previous operation did not result in an unsigned overflow or underflow. For example, during the process of arithmetic addition, an unsigned overflow can occur when two positive signed integers are added together and results in a third positive signed integer that is too large to contain in a single 16-bit register.<br/><br/>

← Older revision	Revision as of 08:12, 4 December 2010
(No difference)

@@ Line 33: / Line 33: @@
 [[CMP@]]<br/>
 <br/>
-* Indicates slight variation from normal Sign Flag behavior. See opcode documentation for more details.
+* Indicates slight variation from normal Carry Flag behavior. See opcode documentation for more details.

← Older revision		Revision as of 20:55, 11 January 2005
Line 32:		Line 32:
	[[CMP]]<br/>		[[CMP]]<br/>
	[[CMP@]]<br/>		[[CMP@]]<br/>
		+	<br/>
		+	* Indicates slight variation from normal Sign Flag behavior. See opcode documentation for more details.

@@ Line 1: / Line 1: @@
 The Carry Flag (C), if set, indicates that the previous operation resulted in an unsigned integer overflow or underflow.  If clear, the previous operation did not result in an unsigned overflow or underflow. For example, during the process of arithmetic addition, an unsigned overflow can occur when two positive signed integers are added together and results in a third positive signed integer that is too large to contain in a single 16-bit register.<br/><br/>
-The behavior of the following opcodes is affected by the status of the Carry Flag.<br/><br/>
+The behavior of the following opcodes is affected by the status of the Carry Flag.<br/>
 [[BC]]<br/>
@@ Line 11: / Line 11: @@
 [[RLC]]*<br/>
 [[RRC]]*<br/>
+<br/>
-In addition to affecting the behavior of the opcodes above, the following opcodes affect the status of the Carry Flag.<br/><br/>
+In addition to affecting the behavior of the opcodes above, the following opcodes affect the status of the Carry Flag.<br/>
 [[CLRC]]<br/>

← Older revision		Revision as of 20:53, 11 January 2005
Line 1:		Line 1:
−	The Carry Flag (C), if set, indicates that the previous operation resulted in an unsigned integer overflow or underflow. If clear, the previous operation did not result in an unsigned overflow or underflow. For example, during the process of arithmetic addition, an unsigned overflow can occur when two positive signed integers are added together and results in a third positive signed integer that is too large to contain in a single 16-bit register.	+	The Carry Flag (C), if set, indicates that the previous operation resulted in an unsigned integer overflow or underflow. If clear, the previous operation did not result in an unsigned overflow or underflow. For example, during the process of arithmetic addition, an unsigned overflow can occur when two positive signed integers are added together and results in a third positive signed integer that is too large to contain in a single 16-bit register.<br/><br/>
		+
		+	The behavior of the following opcodes is affected by the status of the Carry Flag.<br/><br/>
		+
		+	[[BC]]<br/>
		+	[[BNC]]<br/>
		+	[[BUSC]]<br/>
		+	[[BESC]]<br/>
		+	[[ADCR]]<br/>
		+	[[GSWD]]<br/>
		+	[[RLC]]*<br/>
		+	[[RRC]]*<br/>
		+
		+	In addition to affecting the behavior of the opcodes above, the following opcodes affect the status of the Carry Flag.<br/><br/>
		+
		+	[[CLRC]]<br/>
		+	[[SETC]]<br/>
		+	[[NEGR]]<br/>
		+	[[ADCR]]<br/>
		+	[[RSWD]]*<br/>
		+	[[RRC]]*<br/>
		+	[[RLC]]*<br/>
		+	[[SARC]]*<br/>
		+	[[SLLC]]*<br/>
		+	[[ADDR]]<br/>
		+	[[SUBR]]<br/>
		+	[[CMPR]]<br/>
		+	[[ADD]]<br/>
		+	[[ADD@]]<br/>
		+	[[SUB]]<br/>
		+	[[SUB@]]<br/>
		+	[[CMP]]<br/>
		+	[[CMP@]]<br/>