Difference between revisions of "Stack Mode"
m (Protected "Stack Mode" ([edit=autoconfirmed] (indefinite) [move=autoconfirmed] (indefinite))) |
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* Reads via R6 decrement R6 prior to using its value. No other indirect reads have that behavior. | * Reads via R6 decrement R6 prior to using its value. No other indirect reads have that behavior. | ||
| − | * Stack Mode | + | * Reading an operand using Stack Mode takes 3 extra cycles. |
* The [[CP1610]] does not officially support [[SDBD]] with Stack Mode. | * The [[CP1610]] does not officially support [[SDBD]] with Stack Mode. | ||
Stack Mode instructions have the same encoding as [[Indirect Mode]] and [[Immediate Mode]] instructions. | Stack Mode instructions have the same encoding as [[Indirect Mode]] and [[Immediate Mode]] instructions. | ||
Latest revision as of 09:28, 4 December 2010
Stack Mode is simply Indirect Mode via register R6, the stack pointer. GI documentation mentions stack mode separately for three reasons:
- Reads via R6 decrement R6 prior to using its value. No other indirect reads have that behavior.
- Reading an operand using Stack Mode takes 3 extra cycles.
- The CP1610 does not officially support SDBD with Stack Mode.
Stack Mode instructions have the same encoding as Indirect Mode and Immediate Mode instructions.
