CHAPTER 11 CLOCK OUTPUT/BUZZER OUTPUT CONTROLLER
Page 270 of 920
Figure 11 - 2 Format of Clock output select registers n (CKSn)
Note
Use the output clock within a range of 8 MHz. See
AC Characteristics
for details.
Caution 1. Change the output clock after disabling clock output (PCLOEn = 0).
Caution 2. To shift to STOP mode when the main system clock is selected (CSELn = 0), set PCLOEn = 0 before
executing the STOP instruction. When the subsystem clock is selected (CSELn = 1), PCLOEn = 1 can
be set because the clock can be output while RTCLPC in the subsystem clock supply mode control
register (OSMC) = 0 in STOP mode.
Caution 3. In HALT mode when RTCLPC in the subsystem clock supply mode control register (OSMC) = 1 and
while the subsystem clock (f
SUB
) is used for CPU operation, it is not possible to output the
subsystem clock (f
SUB
) from the PCLBUZn pin.
Remark 1.
n = 0, 1
Remark 2.
f
MAIN
: Main system clock frequency
f
SUB
: Subsystem clock frequency
Address: FFFA5H (CKS0), FFFA6H (CKS1)
After reset: 00H
Symbol
<7>
6
5
4
3
2
1
0
CKSn
PCLOEn
0
0
0
CSELn
CCSn2
CCSn1
CCSn0
PCLBUZn pin output enable/disable specification
0
Output disable (default)
1
Output enable
PCLBUZn pin output clock selection
f
MAIN
=
5 MHz
f
MAIN
=
10 MHz
f
MAIN
=
20 MHz
f
MAIN
=
32 MHz
0
0
0
0
f
MAIN
Setting
prohibited
Setting
prohibited
Setting
prohibited
0
0
0
1
f
MAIN
/2
2.5 MHz
Setting
prohibited
Setting
prohibited
0
0
1
0
f
MAIN
/2
2
1.25 MHz
2.5 MHz
5 MHz
8 MHz
0
0
1
1
f
MAIN
/2
3
625 kHz
1.25 MHz
2.5 MHz
4 MHz
0
1
0
0
f
MAIN
/2
4
312.5 kHz
625 kHz
1.25 MHz
2 MHz
0
1
0
1
f
MAIN
/2
11
2.44 kHz
4.88 kHz
9.77 kHz
15.63 kHz
0
1
1
0
f
MAIN
/2
12
1.22 kHz
2.44 kHz
4.88 kHz
7.81 kHz
0
1
1
1
f
MAIN
/2
13
610 Hz
1.22 kHz
2.44 kHz
3.91 kHz
1
0
0
0
f
SUB
32.768 kHz
1
0
0
1
f
SUB
/2
16.384 kHz
1
0
1
0
f
SUB
/2
2
8.192 kHz
1
0
1
1
f
SUB
/2
3
4.096 kHz
1
1
0
0
f
SUB
/2
4
2.048 kHz
1
1
0
1
f
SUB
/2
5
1.024 kHz
1
1
1
0
f
SUB
/2
6
512 Hz
1
1
1
1
f
SUB
/2
7
256 Hz
<R>
Содержание RL78/G1H
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