CHAPTER 7 8-BIT TIMER/EVENT COUNTERS 50 AND 51
Preliminary User’s Manual U19014EJ1V0UD
182
Figure 7-6. Format of Timer Clock Selection Register 51 (TCL51)
Address: FF8CH After reset: 00H R/W
Symbol
7 6 5 4 3 2 1 0
TCL51 0 0 0 0 0
TCL512
TCL511
TCL510
Count clock selection
TCL512 TCL511 TCL510
f
PRS
=
12 MHz
f
PRS
=
16 MHz
0
0
0
TI51 pin falling edge
0
0
1
TI51 pin rising edge
0 1 0
f
PRS
12 MHz
16 MHz
0 1 1
f
PRS
/2
6 MHz
8 MHz
1 0 0
f
PRS
/2
4
750 kHz
1 MHz
1 0 1
f
PRS
/2
6
187.5 kHz
250 kHz
1 1 0
f
PRS
/2
8
46.88 kHz
62.5 kHz
1 1 1
f
PRS
/2
12
2.93 kHz
3.91 kHz
Cautions 1. When rewriting TCL51 to other data, stop the timer operation beforehand.
2. Be sure to clear bits 3 to 7 to 0.
Remark
f
PRS
: Peripheral hardware clock frequency
electronic components distributor