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CHAPTER 8 8-BIT TIMER 1 TM1
8.3 8-Bit Timer 1 Control Registers
The following two types of registers are used to control timer 1.
• Timer clock select register 1 (TCL1)
• 8-bit timer mode control register 1 (TMC1)
(1) Timer clock select register 1 (TCL1)
This register sets count clocks of timer 1.
TCL1 is set with an 8-bit memory manipulation instruction.
RESET input clears to 00H.
Figure 8-2. Timer Clock Select Register 1 (TCL1) Format
Address: FF73H After Reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
TCL1
0
0
0
0
0
TCL12
TCL11
TCL10
TCL12
TCL11
TCL10
Count Clock Selection
0
0
0
Setting prohibited
0
0
1
Setting prohibited
0
1
0
f
X
/2
3
(1.04 MHz)
0
1
1
f
X
/2
4
(523 kHz)
1
0
0
f
X
/2
5
(261 kHz)
1
0
1
f
X
/2
7
(65.4 kHz)
1
1
0
f
X
/2
9
(16.3 kHz)
1
1
1
f
X
/2
11
(4.09 kHz)
Cautions 1. When rewriting TCL1 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
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