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Chapter 9
Clock Generator
Preliminary User’s Manual U15839EE1V0UM00
9.5.2 Power Save Mode Register (PSM)
This is an 8-bit register that control the power save mode and sub-oscillator control.
This register can be read or written in 8-bit or 1-bit units.
Figure 9-16:
Power Save Mode Register (PSM)
7
6
5
4
3
2
1
0
Address
Initial
value
PSM
0
CMODE
0
0
OSCDIS
0
PSM1
PSM0
FFFFF820H
00H
Bit name
Function
CMODE
Calibration mode control bit
0: Calibration timer clock is f
PCLK
1: Calibration timer clock is output from Main-oscillator clock input
OSCDIS
Main clock oscillator enable control bit
1: Main oscillator remains stopped after sub-Watch mode release. The CPU will start from sub-
clock.
0: Main oscillator will be enabled after sub-Watch mode release and used for CPU clock gener-
ation after the oscillation stabilization counter expires.
If this bit is cleared after sub-Watch mode release, the main oscillator will start. After the oscilla-
tion stabilization time expires, the main oscillator can be used as system clock source by setting
the PCC register accordingly.
PSM1, PSM0
Standby mode specification bits
PSM1
PSM0
Standby Mode
0
0
IDLE
0
1
STOP
1
0
WATCH
1
1
Sub-oscillator WATCH mode (Main oscillator shut-down). This mode
can only be enabled if SUBEN is “1”. Otherwise normal WATCH mode
is forced.
Summary of Contents for mPD703128
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