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Clock Generator
(5)
Access
Address
Initial Value
Table 4-8
Bit position
Bit name
7
FRC
6
MCK
5
MFRC
4
CLS
PCC - Processor clock control register
The 8-bit PCC register controls the CPU system clock f
This register can be read/written in 1-bit and 8-bit units.
Writing to this register is protected by a special sequence of instructions.
Please refer to "CPU System Functions" on page 135 for details.
FFFF F828
.
H
40
. The register is initialized by any reset.
H
7
6
5
FRC
MCK
MFRC
R/W
R/W
R/W
PCC register contents (1/2)
Use of built-in Sub oscillator feedback resistor:
0: Feedback resistor connected.
1: Feedback resistor not connected.
Operation of MainOSC:
0: Oscillation enabled.
1: Oscillation stopped.
Note: 1. When the MCK bit is set to 1 while the system is operating with the main
system
clock as the CPU clock, the operation of the main
does not stop. It stops after the CPU clock has been changed to the
subclock.
2. When the main
the subclock, clear the MCK bit to 0 and wait until the oscillation
stabilization time has elapsed before switching back to the main
clock.
Use of main oscillator on-chip feedback resistor:
0: Feedback resistor connected.
1: Feedback resistor not connected.
Status of CPU system clock f
0: Main system clock f
1: Subclock f
operation.
SC
User's Manual U18743EE1V2UM00
4
3
2
CLS
CK3
CK2
R
R/W
R/W
Function
system
clock is stopped and the device is operating on
:
VBCLK
operation.
XX
Chapter 4
.
VBCLK
1
0
CK1
CK0
R/W
R/W
system
system
clock
173
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