Control Registers - NEC V850E/RS1 User Manual

18.8 Control Registers

(1) Power save control register (PSC)
This is an 8-bit register that controls the standby function. The STP bit of this register is used to
specify the STOP mode. The PSC register is a special register (refer to 3.2.3 "Special regis-
ters" on page 70). Data can be written to this register only in a specific sequence so that its
contents are not rewritten by mistake due to a program hang-up.
This register can be read or written in 8-bit or 1-bit units.
Symbol
PSC
R/W
Cautions: 1. When set to IDLE1 mode, IDLE2 mode and STOP mode, set PSM1 and PSM0 bit to
Downloaded from Elcodis.com electronic components distributor
Chapter 18 Standby Function
Figure 18-7: Power Save Control Register (PSC) Format
7 6 5
NMI2M NMI1M 0 INTM
R/W R/W R R/W
NMI2M Standby mode release control by NMI pin input
0 Enables standby mode release through NMI pin input
1 Disables standby mode release through NMI pin input
NMI1M Standby mode release control upon occurrence of INTWDT2
0 Enables standby mode release through INTWDT2 signal
1 Disables standby mode release through INTWDT2 signal
INTM Standby mode release control through maskable interrupt request
0 Enables standby mode release through maskable interrupt request
1 Disables standby mode release through maskable interrupt request
STP
0 Normal mode
1 Standby mode
1 on PSMR register then set STP bit to 1.
2. Settings of the NMI2M, NMI1M, and INTM bits are invalid when HALT mode is
released.
3. Be sure to clear bit 5 to 0.
User's Manual U16702EE3V2UD00
4 3 2 1
0 0 STP
R R R/W
Standby mode setting
0 Address After reset
0 FFFFF1FEH 00H
R
737