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CHAPTER 9 8-BIT TIMER/EVENT COUNTERS 2, 3 TM2, TM3
Figure 9-4. Timer Clock Select Register 3 (TCL3) Format
Address: FF75H After Reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
TCL3
0
0
0
0
0
TCL32
TCL31
TCL30
TCL32
TCL31
TCL30
Count Clock Selection
0
0
0
TIO3 Falling edge
0
0
1
TIO3 Rising edge
0
1
0
f
X
/2
4
(523 kHz)
0
1
1
f
X
/2
6
(130 kHz)
1
0
0
f
X
/2
7
(65.4 kHz)
1
0
1
f
X
/2
8
(32.7 kHz)
1
1
0
f
X
/2
10
(8.18 kHz)
1
1
1
f
X
/2
12
(2.04 kHz)
Cautions 1. When rewriting TCL3 to other data, stop the timer operation beforehand.
2. Set bits 3 to 7 to 0.
Remarks
1. f
X
: Main system clock oscillation frequency
2. Figures in parentheses apply to operation with f
X
= 8.38 MHz
(2) 8-bit timer mode control register n (TMCn: n = 2, 3)
TMCn is a register which sets up the following five types.
<1>
8-bit counter n (TMn) count operation control
<2>
8-bit counter n (TMn) operating mode selection
<3>
Timer output F/F (flip flop) status setting
<4>
Active level selection in timer F/F control or PWM (free-running) mode.
<5>
Timer output control
TMCn is set with a 1-bit or 8-bit memory manipulation instruction.
RESET input sets to 04H.
Figure 9-5 shows TMCn format.
Содержание mPD780973 Series
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