NEC mPD780204, Руководство пользователя

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CHAPTER 7 8-BIT TIMER/EVENT COUNTER
149
User’s Manual U11302EJ4V0UM
(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 7-4. Square-Wave Output Ranges When 8-Bit Timer/Event Counter
Is Used as 16-Bit Timer/Event Counter
Minimum Pulse Width Maximum Pulse Width Resolution
2 x 1/f
X
(400 ns) 2 17 x 1/f
X
(26.2 ms) 2 x 1/f
X
(400 ns)
2 2 x 1/f
X
(800 ns) 2 18 x 1/f
X
(52.4 ms) 2 2 x 1/f
X
(800 ns)
2
3
x 1/f
X
(1.6
µ
s) 2
19
x 1/f
X
(104.9 ms) 2
3
x 1/f
X
(1.6
µ
s)
2 4 x 1/f
X
(3.2
µ
s) 2 20 x 1/f
X
(209.7 ms) 2 4 x 1/f
X
(3.2
µ
s)
2
5
x 1/f
X
(6.4
µ
s) 2
21
x 1/f
X
(419.4 ms) 2
5
x 1/f
X
(6.4
µ
s)
2 6 x 1/f
X
(12.8
µ
s) 2 22 x 1/f
X
(838.9 ms) 2 6 x 1/f
X
(12.8
µ
s)
2 7 x 1/f
X
(25.6
µ
s) 2 23 x 1/f
X
(1.7 s) 2 7 x 1/f
X
(25.6
µ
s)
2
8
x 1/f
X
(51.2
µ
s) 2
24
x 1/f
X
(3.4 s) 2
8
x 1/f
X
(51.2
µ
s)
2 9 x 1/f
X
(102.4
µ
s) 2 25 x 1/f
X
(6.7 s) 2 9 x 1/f
X
(102.4
µ
s)
2
10
x 1/f
X
(204.8
µ
s) 2
26
x 1/f
X
(13.4 s) 2
10
x 1/f
X
(204.8
µ
s)
2 12 x 1/f
X
(819.2
µ
s) 2 28 x 1/f
X
(53.7 s) 2 12 x 1/f
X
(819.2
µ
s)
Remarks 1. f
X
: Main system clock oscillation frequency
2. Figures in parentheses apply to operation with f
X
= 5.0 MHz.