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(3) Operation as a Square Wave Output
Operates as a square wave output at the desired frequency with the values set previously in the 8 bit conveyor
registers 10 and 20 (CR10, CR20) as the interval. When setting the count value, the value of the upper 8
bits is set in CR20 and the value of the lower 8 bits is set in CR10.
The TO2/P32 pin output status is reversed at intervals of the count value preset to CR10 and CR20 by setting
bit 4 (TOE2) of the 8-bit timer output control register (TOC1) to 1. This enables a square wave with any selected
frequency to be output.
Table 9-10. Square-Wave Output Ranges When 2-Channel 8-Bit Timer/Event Counters
(TM1 and TM2) are Used as 16-Bit Timer/Event Counter
Minimum Pulse Width
MCS = 1
MCS = 0
2
2
1/f
2
X
(400 ns)
(800 ns)
2
3
2
1/f
2
X
(800 ns)
(1.6 s)
3
4
2
1/f
2
X
(1.6 s)
(3.2 s)
4
5
2
1/f
2
X
(3.2 s)
(6.4 s)
5
6
2
1/f
2
X
(6.4 s)
(12.8 s)
6
7
2
1/f
2
X
(12.8 s)
(25.6 s)
7
8
2
1/f
2
X
(25.6 s)
(51.2 s)
8
9
2
1/f
2
X
(51.2 s)
(102.4 s)
9
10
2
1/f
2
X
(102.4 s)
(204.8 s)
11
12
2
1/f
2
X
(409.6 s)
(819.2 s)
Remarks 1. f
: Main system clock oscillation frequency
X
2. MCS : Bit 0 of oscillation mode selection register (OSMS)
3. Values in parentheses when operated at f
234
CHAPTER 9 8-BIT TIMER/EVENT COUNTERS
Maximum Pulse Width
MCS = 1
17
1/f
2
1/f
X
X
(26.2 ms)
18
1/f
2
1/f
X
X
(52.4 ms)
19
1/f
2
1/f
X
X
(104.9 ms)
20
1/f
2
1/f
X
X
(209.7 ms)
21
1/f
2
1/f
X
X
(419.4 ms)
22
1/f
2
1/f
X
X
(838.9 ms)
23
1/f
2
1/f
X
X
(1.7 s)
24
1/f
2
1/f
X
X
(3.4 s)
25
1/f
2
1/f
X
X
(6.7 s)
27
1/f
2
1/f
X
X
(26.8 s)
Resolution
MCS = 0
MCS = 1
18
2
1/f
2
1/f
X
X
(52.4 ms)
(400 ns)
19
2
2
1/f
2
1/f
X
X
(104.9 ms)
(800 ns)
20
3
2
1/f
2
1/f
X
X
(209.7 ms)
(1.6 s)
21
4
2
1/f
2
1/f
X
X
(419.4 ms)
(3.2 s)
22
5
2
1/f
2
1/f
X
X
(838.9 ms)
(6.4 s)
23
6
2
1/f
2
1/f
X
X
(1.7 s)
(12.8 s)
24
7
2
1/f
2
1/f
X
X
(3.4 s)
(25.6 s)
25
8
2
1/f
2
1/f
X
X
(6.7 s)
(51.2 s)
26
9
2
1/f
2
1/f
X
X
(13.4 s)
(102.4 s)
28
11
2
1/f
2
1/f
X
X
(53.7 s)
(409.6 s)
= 5.0 MHz.
X
MCS = 0
2
2
1/f
X
(800 ns)
3
2
1/f
X
(1.6 s)
4
2
1/f
X
(3.2 s)
5
2
1/f
X
(6.4 s)
6
2
1/f
X
(12.8 s)
7
2
1/f
X
(25.6 s)
8
2
1/f
X
(51.2 s)
9
2
1/f
X
(102.4 s)
10
2
1/f
X
(204.8 s)
12
2
1/f
X
(819.2 s)
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