Bit Timer/Event Counter Square-Wave Output Ranges - NEC PD78056F User Manual

(3) Operation as a Square Wave Output
Operates as a square wave output at the desired frequency with the values set previously in the 8 bit conveyor
registers 10 and 20 (CR10, CR20) as the interval.
The TO1/P31 or TO2/P32 pin output status is reversed at intervals of the count value preset to CR10 or CR20
by setting bit 0 (TOE1) or 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 9-8. 8-Bit Timer/Event Counter Square-Wave Output Ranges
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 : Bit 0 of oscillation mode selection register (OSMS)
3. Values in parentheses when operated at f
CHAPTER 9 8-BIT TIMER/EVENT COUNTERS
Maximum Pulse Width
MCS = 1
9
1/f 2 1/f
X X
(102.4 s)
10
1/f 2 1/f
X X
(204.8 s)
11
1/f 2 1/f
X X
(409.6 s)
12
1/f 2 1/f
X X
(819.2 s)
13
1/f 2 1/f
X X
(1.64 ms)
14
1/f 2 1/f
X X
(3.28 ms)
15
1/f 2 1/f
X X
(6.55 ms)
16
1/f 2 1/f
X X
(13.1 ms)
17
1/f 2 1/f
X X
(26.2 ms)
19
1/f 2 1/f
X X
(104.9 ms)
Resolution
MCS = 0 MCS = 1
10
2 1/f 2 1/f
X X
(204.8 s) (400 ns)
11 2
2 1/f 2 1/f
X X
(409.6 s) (800 ns)
12 3
2 1/f 2 1/f
X X
(819.2 s) (1.6 s)
13 4
2 1/f 2 1/f
X X
(1.64 ms) (3.2 s)
14 5
2 1/f 2 1/f
X X
(3.28 ms) (6.4 s)
15 6
2 1/f 2 1/f
X X
(6.55 ms) (12.8 s)
16 7
2 1/f 2 1/f
X X
(13.1 ms) (25.6 s)
17 8
2 1/f 2 1/f
X X
(26.2 ms) (51.2 s)
18 9
2 1/f 2 1/f
X X
(52.4 ms) (102.4 s)
20 11
2 1/f 2 1/f
X X
(209.7 ms) (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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