CHAPTER 8 CLOCK GENERATION FUNCTION
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User’s Manual U14492EJ3V0UD
(3) Power save control register (PSC)
This is an 8-bit register that controls the power save function. This register, which is one of the specific
registers, is effective only when accessed by a specific sequence during a write operation.
This register can be read/written in 8-bit or 1-bit units.
Caution
It is impossible to set STB bit and NMIM or INTM bit at the same time. Be sure to set STB
bit after setting NMIM or INTM bit.
7
6
<5>
<4>
3
2
<1>
0
Address
Initial value
PSC
0
0
NMIM
INTM
0
0
STB
0
FFFFF1FEH
00H
Bit Position
Bit Name
Function
5
NMIM
This is the enable/disable setting bit for standby mode release using valid edge
input of NMI.
0: Enables NMI cancellation
1: Disables NMI cancellation
4
INTM
This is the enable/disable setting for standby mode release using an unmasked
maskable interrupt (INTPn) (n = 0 to 6, 20 to 25, 30, 31, 100, 101, 110, 111).
0: Enables maskable interrupt cancellation
1: Disables maskable interrupt cancellation
1
STB
Indicates the standby mode status.
If 1 is written to this bit, the system enters IDLE or software STOP mode (set by
the PSM bit of the PSMR register). When standby mode is released, this bit is
automatically reset to 0.
0: Standby mode is released
1: Standby mode is in effect
Data is set in the power save control register (PSC) according to the following sequence.
<1> Set the power save mode register (PSMR) (with the following instructions).
•
Store instruction (ST/SST instruction)
•
Bit manipulation instruction (SET1/CLR1/NOT1 instruction)
<2> Prepare data in any one of the general-purpose registers to set in the specific register.
<3> Write arbitrary data to the command register (PRCMD).
<4> Set the power save control register (PSC) (with the following instructions).
•
Store instruction (ST/SST instruction)
•
Bit manipulation instruction (SET1/CLR1/NOT1 instruction)
<5> Insert the NOP instructions (5 instructions (<5> to <9>).
Содержание V850E/IA1 mPD703116
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