NEC uPD78052(A) User Manual
219
CHAPTER 9 8-BIT TIMER/EVENT COUNTERS 1 AND 2
(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 9-4. Square-Wave Output Ranges when 8-Bit Timer/Event
Counters 1 and 2 are Used as 16-Bit Timer/Event Counters
Minimum Pulse Width
Maximum Pulse Width
Resolution
MCS = 1
MCS = 0
MCS = 1
MCS = 0
MCS = 1
MCS = 0
2
×
1/f
X
2
2
×
1/f
X
2
17
×
1/f
X
2
18
×
1/f
X
2
×
1/f
X
2
2
×
1/f
X
(400 ns)
(800 ns)
(26.2 ms)
(52.4 ms)
(400 ns)
(800 ns)
2
2
×
1/f
X
2
3
×
1/f
X
2
18
×
1/f
X
2
19
×
1/f
X
2
2
×
1/f
X
2
3
×
1/f
X
(800 ns)
(1.6
µ
s)
(52.4 ms)
(104.9 ms)
(800 ns)
(1.6
µ
s)
2
3
×
1/f
X
2
4
×
1/f
X
2
19
×
1/f
X
2
20
×
1/f
X
2
3
×
1/f
X
2
4
×
1/f
X
(1.6
µ
s)
(3.2
µ
s)
(104.9 ms)
(209.7 ms)
(1.6
µ
s)
(3.2
µ
s)
2
4
×
1/f
X
2
5
×
1/f
X
2
20
×
1/f
X
2
21
×
1/f
X
2
4
×
1/f
X
2
5
×
1/f
X
(3.2
µ
s)
(6.4
µ
s)
(209.7 ms)
(419.4 ms)
(3.2
µ
s)
(6.4
µ
s)
2
5
×
1/f
X
2
6
×
1/f
X
2
21
×
1/f
X
2
22
×
1/f
X
2
5
×
1/f
X
2
6
×
1/f
X
(6.4
µ
s)
(12.8
µ
s)
(419.4 ms)
(838.9 ms)
(6.4
µ
s)
(12.8
µ
s)
2
6
×
1/f
X
2
7
×
1/f
X
2
22
×
1/f
X
2
23
×
1/f
X
2
6
×
1/f
X
2
7
×
1/f
X
(12.8
µ
s)
(25.6
µ
s)
(838.9 ms)
(1.7 s)
(12.8
µ
s)
(25.6
µ
s)
2
7
×
1/f
X
2
8
×
1/f
X
2
23
×
1/f
X
2
24
×
1/f
X
2
7
×
1/f
X
2
8
×
1/f
X
(25.6
µ
s)
(51.2
µ
s)
(1.7 s)
(3.4 s)
(25.6
µ
s)
(51.2
µ
s)
2
8
×
1/f
X
2
9
×
1/f
X
2
24
×
1/f
X
2
25
×
1/f
X
2
8
×
1/f
X
2
9
×
1/f
X
(51.2
µ
s)
(102.4
µ
s)
(3.4 s)
(6.7 s)
(51.2
µ
s)
(102.4
µ
s)
2
9
×
1/f
X
2
10
×
1/f
X
2
25
×
1/f
X
2
26
×
1/f
X
2
9
×
1/f
X
2
10
×
1/f
X
(102.4
µ
s)
(204.8
µ
s)
(6.7 s)
(13.4 s)
(102.4
µ
s)
(204.8
µ
s)
2
11
×
1/f
X
2
12
×
1/f
X
2
27
×
1/f
X
2
28
×
1/f
X
2
11
×
1/f
X
2
12
×
1/f
X
(409.6
µ
s)
(819.2
µ
s)
(26.8 s)
(53.7 s)
(409.6
µ
s)
(819.2
µ
s)
Remarks 1. f
X
: Main system clock oscillation frequency
2. MCS : Oscillation mode selection register (OSMS) bit 0
3. Values in parentheses when operated at f
X
= 5.0 MHz.