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7.3 8-Bit Timer 1 TM1 Control Registers
The following two types of registers are used to control 8-bit timer 1 TM1.
• 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 8-bit timer 1.
TCL1 is set with an 8-bit memory manipulation instruction.
RESET input clears TCL1 to 00H.
Figure 7-2. Timer Clock Select Register 1 (TCL1) Format
Address: FF73H
After Reset: 00H
Symbol
7
TCL1
0
TCL12
0
0
1
1
1
1
Other than above
Cautions 1. When rewriting TCL1 to other data, stop the timer operation beforehand.
2. Bits 3 to 7 must be set to 0.
Remarks 1. f
: Main system clock oscillation frequency
X
2. Figures in parentheses apply to operation with f
CHAPTER 7 8-BIT TIMER 1 TM1
R/W
6
5
4
0
0
0
TCL11
TCL10
3
1
0
f
/2
(1.04 MHz)
X
4
1
1
f
/2
(523 kHz)
X
5
0
0
f
/2
(261 kHz)
X
7
0
1
f
/2
(65.4 kHz)
X
9
1
0
f
/2
(16.3 kHz)
X
11
1
1
f
/2
X
Setting prohibited
Preliminary User's Manual U14581EJ3V0UM00
3
2
0
TCL12
Count Clock Selection
(4.09 kHz)
= 8.38 MHz
X
1
0
TCL11
TCL10
115
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