CHAPTER 4 CLOCK GENERATION FUNCTION
User’s Manual U15109EJ3V0UD
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<3> MCK
←
1:
Only when the main clock is stopped.
(b) Example of subclock operation
→
→
→
→
main clock operation setting
<1> MCK
←
0:
Main clock oscillation start
<2> Insert waits using a program and wait until the main clock oscillation stabilization time elapses.
<3> CK2
←
0:
Bit manipulation instructions are recommended. Do not change CK1 and
CK0.
<4> Main clock operation:
It takes up to two instructions to start main clock operation after the CK2
bit is set.
(2) Power save control register (PSC)
This is a specific register. It can be written to only when a specified combination of sequences is used.
For details, see
3.4.9 Specific registers
.
This register can be read/written in 8- or 1-bit units.
After reset:
C0H
R/W
Address: FFFFF070H
7
6
5
4
3
<2>
<1>
0
PSC
DCLK1
DCLK0
0
0
0
IDLE
STP
0
DCLK1
DCLK0
Specification of CLKOUT pin operation
0
0
Output enabled
0
1
Hi-Z output
Note 1
1
0
Setting prohibited
1
1
Output disabled (after reset)
IDLE
IDLE mode setting
0
Normal mode
1
IDLE mode
Note 2
STP
STOP mode setting
0
Normal mode
1
STOP mode
Note 3
Notes 1.
Hi-Z cannot be output from the in-circuit emulator.
2.
When IDLE mode is canceled, this bit is automatically reset to 0.
3.
When STOP mode is canceled, this bit is automatically reset to 0.
Caution
The DCLK0 and DCLK1 bits should be manipulated in 8-bit units.