Stack Mode
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.