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CHAPTER 9 8-BIT TIMER/EVENT COUNTER
219
(3) Square-wave output operation
The 8-bit timer/event counter operates as a square wave with any selected frequency which is output at intervals
of the value preset to 8-bit compare registers (CR10 and CR20). When setting the count value, the upper 8-
bit value is set as CR20 and the lower 8-bit value as CR10.
The TO2/P32 pin output status is inverted 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 Tmer/Event Counter
TCL13
TCL12
TCL11
TCL10
Minimum Pulse Width
Maximum Pulse Width
Resolution
0
1
1
0
2
2
×
1/f
X
(400 ns)
2
18
×
1/f
X
(26.2 ms)
2
2
×
1/f
X
(400 ns)
0
1
1
1
2
3
×
1/f
X
(800 ns)
2
19
×
1/f
X
(52.4 ms)
2
3
×
1/f
X
(800 ns)
1
0
0
0
2
4
×
1/f
X
(1.6
µ
s)
2
20
×
1/f
X
(104.9 ms)
2
4
×
1/f
X
(1.6
µ
s)
1
0
0
1
2
5
×
1/f
X
(3.2
µ
s)
2
21
×
1/f
X
(209.7 ms)
2
5
×
1/f
X
(3.2
µ
s)
1
0
1
0
2
6
×
1/f
X
(6.4
µ
s)
2
22
×
1/f
X
(419.4 ms)
2
6
×
1/f
X
(6.4
µ
s)
1
0
1
1
2
7
×
1/f
X
(12.8
µ
s)
2
23
×
1/f
X
(838.9 ms)
2
7
×
1/f
X
(12.8
µ
s)
1
1
0
0
2
8
×
1/f
X
(25.6
µ
s)
2
24
×
1/f
X
(1.7 s)
2
8
×
1/f
X
(25.6
µ
s)
1
1
0
1
2
9
×
1/f
X
(51.2
µ
s)
2
25
×
1/f
X
(3.4 s)
2
9
×
1/f
X
(51.2
µ
s)
1
1
1
0
2
10
×
1/f
X
(102.4
µ
s)
2
26
×
1/f
X
(6.7 s)
2
10
×
1/f
X
(102.4
µ
s)
1
1
1
1
2
12
×
1/f
X
(409.6
µ
s)
2
28
×
1/f
X
(26.8 s)
2
12
×
1/f
X
(409.6
µ
s)
Remarks
1.
f
X
: Main system clock oscillation frequency
2.
TCL10 to TCL13: Bits 0 to 3 of the timer clock select register 1 (TCL1)
3.
Values in parentheses apply to operation with f
X
= 10.0 MHz.
Figure 9-13. Square-Wave Output Operation Timings
Interval Time
TO2
TM1
TM2
00H
01H
N
N
N+1
FFH 00H
FFH 00H
FFH 00H 01H
00H
Count Clock
CR10
CR20
Count Start
Lebel Inversion
Counter Clear
01H
02H
M–1 M
M
N 00H 01H
00H
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