7751 Datasheet, PDF (259/540 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER

STOP MODE
10.3 Precautions for Stop mode
10.3 Precautions for Stop mode
1. When using the STP instruction with the mask ROM version, select “STP instruction enable” with the STP
instruction option on the MASK ROM ORDER CONFIRMATION FORM.
The STP instruction is always enabled in the built-in PROM version and the flash memory version.
2. When executing the STP instruction after writing to the internal area or an external area, the three NOP
instructions must be inserted to complete the write operation before the STP instruction is executed.
STA A, !!!! ; Writing instruction
NOP
; NOP instruction insertion
NOP
;
NOP
;
STP
; STP instruction
Fig. 10.3.1 NOP instruction insertion example
10–6
7751 Group User’s Manual