HD64F3437TF16 Datasheet, PDF (579/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

22.3.5 Application Note
1. The I/O ports retain their current states in software standby mode. If a port is in the high output
state, the current dissipation caused by the output current is not reduced.
BSET
SLEEP
BSET
MOV. W
MOV. W
MOV. W
MOV. W
JSR
•
•
•
#7, @SYSCR:8
•
•
•
•
•
•
#7, @SYSCR:8
#H'0180, R0
R0, @H'FF00
#H'5470, R0
R0, @H'FF02
@H'FF00
•
•
•
; Sets the SSBY bit
; Executes the SLEEP instruction
Replace the underlined part
(SLEEP instruction) with
the code shown below.
; Sets the SSBY bit
; Writes the SLEEP code H'0180
; to the RAM
; Writes the RTS code H'5470
; to the RAM
; Subroutine branch
* Registers and RAM addresses are
arbitrary.
Note: The current responsible for this phenomenon also flows when the mode is changed to
SLEEP mode. In order to reduce current dissipation, therefore, please use the preliminary
remedy for the SLEEP instruction when changing the mode to SLEEP mode.
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