CHAPTER 19 STANDBY FUNCTION
User’s Manual U16896EJ2V0UD
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19.2 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
standby mode. The PSC register is a special register that can be written to only in a special sequence (refer
to
3.4.7 Special registers
).
This register can be read or written in 8-bit or 1-bit units.
Reset sets this register to 00H.
NMI2M
PSC
0
NMI0M
INTM
0
0
STP
0
Releasing standby mode
Note
by INTWDT2 signal enabled
Releasing standby mode
Note
by INTWDT2 signal disabled
NMI2M
0
1
Control of releasing standby mode
Note
by INTWDT2 signal
Releasing standby mode
Note
by NMI pin input enabled
Releasing standby mode
Note
by NMI pin input disabled
NMI0M
0
1
Control of releasing standby mode
Note
by NMI pin input
Releasing standby mode
Note
by maskable interrupt request signals enabled
Releasing standby mode
Note
by maskable interrupt request signals disabled
INTM
0
1
Control of releasing standby mode
Note
by maskable interrupt request signals
Normal mode
Standby mode
Note
STP
0
1
Standby mode
Note
setting
After reset: 00H R/W Address: FFFFF1FEH
< >
< >
< >
< >
Note
In this case, standby mode means the IDLE/STOP mode; it does not include the HALT mode.
Cautions 1. If the NMI2M, NMI0M, and INTM bits, and the STP bit are set to 1 at the same time, the
setting of NMI2M, NMI0M, and INTM bits becomes invalid. If there is an unmasked
interrupt request signal being held pending when the IDLE/STOP mode is set, set the bit
corresponding to the interrupt request signal (NMI2M, NMI0M, or INTM) to 1, and then set
the STP bit to 1.
2. When the IDLE/STOP mode is set, set the PSMR.PSM bit and then set the STP bit to 1.