8-Bit Timer/Event Counters 5 And 6 Functions; 8-Bit Timer/Event Counters 5 And 6 Interval Times - NEC PD78081(A) User Manual

6.1 8-Bit Timer/Event Counters 5 and 6 Functions

The 8-bit timer/event counters 5 and 6 (TM5 and TM6) have the following functions.
• Interval timer
• External event counter
• Square-wave output
• PWM output
(1) 8-bit interval timer
Interrupt requests are generated at the preset time intervals.
Minimum Interval Time
MCS = 1
—
1/f
X
(200 ns)
2 1/f
X
(400 ns)
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)
11
2 1/f
X
(409.6 s)
Remarks 1. f
X
2. MCS : Oscillation mode selection register (OSMS) bit 0
3. Values in parentheses when operated at f
80
CHAPTER 6 8-BIT TIMER/EVENT COUNTERS 5 AND 6
Table 6-2. 8-Bit Timer/Event Counters 5 and 6 Interval Times
Maximum Interval Time
MCS = 0 MCS = 1
1/f
X
—
(200 ns)
8
2 1/f 2
X
(400 ns) (51.2 s)
2 9
2 1/f 2
X
(800 ns) (102.4 s)
3 10
2 1/f 2
X
(1.6 s) (204.8 s)
4 11
2 1/f 2
X
(3.2 s) (409.6 s)
5 12
2 1/f 2
X
(6.4 s) (819.2 s)
6 13
2 1/f 2
X
(12.8 s) (1.64 ms)
7 14
2 1/f 2
X
(25.6 s) (3.28 ms)
8 15
2 1/f 2
X
(51.2 s) (6.55 ms)
9 16
2 1/f 2
X
(102.4 s) (13.1 ms)
10 17
2 1/f 2
X
(204.8 s) (26.2 ms)
12 19
2 1/f 2
X
(819.2 s) (104.9 ms)
: Main system clock oscillation frequency
MCS = 0
8
2 1/f
X
(51.2 s)
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)
18
1/f 2 1/f
X X
(52.4 ms)
20
1/f 2 1/f
X X
(209.7 ms)
= 5.0 MHz.
X
Resolution
MCS = 1 MCS = 0
1/f
X
—
(200 ns)
1/f 2 1/f
X
(200 ns) (400 ns)
2
2 1/f 2 1/f
X
(400 ns) (800 ns)
2 3
2 1/f 2 1/f
X
(800 ns) (1.6 s)
3 4
2 1/f 2 1/f
X
(1.6 s) (3.2 s)
4 5
2 1/f 2 1/f
X
(3.2 s) (6.4 s)
5 6
2 1/f 2 1/f
X
(6.4 s) (12.8 s)
6 7
2 1/f 2 1/f
X
(12.8 s) (25.6 s)
7 8
2 1/f 2 1/f
X
(25.6 s) (51.2 s)
8 9
2 1/f 2 1/f
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)
X
X
X
X
X
X
X
X
X
1/f
X
1/f
X