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CHAPTER 4 CLOCK GENERATION FUNCTION
User’s Manual U15109EJ3V0UD
121
4.2 Configuration
Figure 4-1. Clock Generator
f
XT
f
XT
f
XX
/8
f
XX
STP,
MCK
FRC
Prescaler
Prescaler
X2
X1
XT2
XT1
IDLE
Main clock
oscillator
Subclock
oscillator
IDLE
control
IDLE
control
Selector
Clock supplied to
watch timer, etc.
Clock supplied to
peripheral hardware
HALT
HALT
control
CPU clock
(f
CPU
)
CLKOUT
f
XX
/4
f
XX
/2
CK2 to CK0
4.3 Clock Output Function
This function outputs the CPU clock via the CLKOUT pin.
When clock output is enabled, the CPU clock is output via the CLKOUT pin. When it is disabled, a low-level signal
is output via the CLKOUT pin.
Output is stopped in the IDLE or STOP mode (fixed to low level).
This function is controlled via the DCLK1 and DCLK0 bits in the PSC register.
A high-impedance status is set during the reset period. After reset is canceled, a low level is output.
Caution
While CLKOUT is being output, changing the CPU clock (CK2 to CK0 bits of PCC register) is
disabled.