268
Chapter 9
Clock Generator
Preliminary User’s Manual U15839EE1V0UM00
9.5 Register
Description
9.5.1 Power Save Control Register (PSC)
This is an 8-bit register that controls the power save mode. Data can be written only in a sequence of
specific instructions so that its contents are not easily rewritten in case of program hang-up.
This register can be read or written in 8-bit or 1-bit units.
Figure 9-15:
Power Save Control Register (PSC)
Note:
If this bit is set to 1, proper operation can not be guaranteed!
Data is set in the power save control register (PSC) according to the following sequence.
<1> Set the power save mode register (PSM) (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 to 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> Assert the NOP instructions (5 instructions (<5> to <9>).
7
6
5
4
3
2
1
0
Address
Initial
value
PSC
0
Note
NMI1M
NMI0M
INTM
0
STP
FFFFF1FEH
00H
Bit name
Function
NMI1M
Intsignal release mask
0: Permits NMI1 requests
1: Prohibits NMI0 requests
NMI0M
Intsignal release mask
0: Permits NMI0 requests
1: Prohibits NMI0 requests
INTM
Intsignal release mask
0: Release by maskable interrupt
1: Don’t release by maskable interrupt
STP
Power save mode specification
0: IDLE, WATCH, STOP mode are released
1: IDLE, WATCH, STOP mode are entered
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