NEC PD78052 User Manual page 219

(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
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 : Oscillation mode selection register (OSMS) bit 0
3. Values in parentheses when operated at f
CHAPTER 9 8-BIT TIMER/EVENT COUNTERS 1 AND 2
Counters 1 and 2 are Used as 16-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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