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(2) External event counter
The number of pulses of an externally input signal can be measured.
(3) Square-wave output
A square wave with any selected frequency can be output.
Table 9-2. 8-Bit Timer/Event Counters 1 and 2 Square-Wave Output Ranges
Minimum Pulse Width
MCS = 1
MCS = 0
2 x 1/f
2
2
x 1/f
X
(400 ns)
(800 ns)
2
2
x 1/f
2
3
x 1/f
X
(800 ns)
(1.6 s)
3
4
2
x 1/f
2
x 1/f
X
(1.6 s)
(3.2 s)
4
5
2
x 1/f
2
x 1/f
X
(3.2 s)
(6.4 s)
2
5
x 1/f
2
6
x 1/f
X
(6.4 s)
(12.8 s)
2
6
x 1/f
2
7
x 1/f
X
(12.8 s)
(25.6 s)
7
8
2
x 1/f
2
x 1/f
X
(25.6 s)
(51.2 s)
8
9
2
x 1/f
2
x 1/f
X
(51.2 s)
(102.4 s)
2
9
x 1/f
2
10
x 1/f
X
(102.4 s)
(204.8 s)
2
11
x 1/f
2
12
x 1/f
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. Figures in parentheses apply to operation with f
CHAPTER 9 8-BIT TIMER/EVENT COUNTERS 1 AND 2
Maximum Pulse Width
MCS = 1
2
9
x 1/f
X
X
(102.4 s)
2
10
x 1/f
X
X
(204.8 s)
11
2
x 1/f
X
X
(409.6 s)
12
2
x 1/f
X
X
(819.2 s)
2
13
x 1/f
X
X
(1.64 ms)
2
14
x 1/f
X
X
(3.28 ms)
15
2
x 1/f
X
X
(6.55 ms)
16
2
x 1/f
X
X
(13.1 ms)
2
17
x 1/f
X
X
(26.2 ms)
2
19
x 1/f
X
X
(104.9 ms)
Resolution
MCS = 0
MCS = 1
2
10
x 1/f
2 x 1/f
X
X
(204.8 s)
(400 ns)
2
11
x 1/f
2
2
x 1/f
X
X
(409.6 s)
(800 ns)
12
3
2
x 1/f
2
x 1/f
X
X
(819.2 s)
(1.6 s)
13
4
2
x 1/f
2
x 1/f
X
X
(1.64 ms)
(3.2 s)
2
14
x 1/f
2
5
x 1/f
X
X
(3.28 ms)
(6.4 s)
2
15
x 1/f
2
6
x 1/f
X
X
(6.55 ms)
(12.8 s)
16
7
2
x 1/f
2
x 1/f
X
X
(13.1 ms)
(25.6 s)
17
8
2
x 1/f
2
x 1/f
X
X
(26.2 ms)
(51.2 s)
2
18
x 1/f
2
9
x 1/f
X
X
(52.4 ms)
(102.4 s)
2
20
x 1/f
2
11
x 1/f
X
X
(209.7 ms)
(409.6 s)
= 5.0 MHz.
X
MCS = 0
2
2
x 1/f
X
(800 ns)
2
3
x 1/f
X
(1.6 s)
4
2
x 1/f
X
(3.2 s)
5
2
x 1/f
X
(6.4 s)
2
6
x 1/f
X
(12.8 s)
2
7
x 1/f
X
(25.6 s)
8
2
x 1/f
X
(51.2 s)
9
2
x 1/f
X
(102.4 s)
2
10
x 1/f
X
(204.8 s)
2
12
x 1/f
X
(819.2 s)
225
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