NEC V850ES/SA2 UPD703201 Manual page 210

(2) Power save control register (PSC)
The power save control register (PSC) is a special register. Data can be written to this register only in
combination of specific sequences (refer to 3.4.8 Special registers).
This register can be read or written in 8-bit or 1-bit units.
After reset:
PSC
(3) Power save mode register (PSMR)
This is an 8-bit register that controls the operation status and clock operation in the power save mode.
It can be read or written in 8-bit or 1-bit units.
RESET input clears this register to 00H.
After reset:
PSMR
Cautions 1. Be sure to clear bits 1 to 7 of the PSMR register to 0.
2. The PSM bit is valid only when the STP bit of the PSC register is set to 1.
(4) Oscillation stabilization time select register (OSTS)
This is an 8-bit register that controls the operation status and clock in the power save mode.
Refer to 9.1.3 (1) Oscillation stabilization time select register (OSTS).
210
CHAPTER 6 CLOCK GENERATION FUNCTION
00H R/W Address: FFFFF1FEH
0 0 0
STP Setting of software STOP mode
0 Normal mode
1 Software STOP mode
00H R/W Address: FFFFF820H
0 0 0
PSM Specifies operation in software standby mode
(valid when bit 1 (STP) of the PSC register is set to 1)
0 IDLE mode
1
Software STOP mode
Preliminary User's Manual U15905EJ1V0UD
0 0 0
0 0 0
STP 0
0 PSM