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CHAPTER 6
6.1 Functions of 8-Bit Timer/Event Counters 00 and 01
The 8-bit timer/event counters (TM00 and TM01) have the following functions.
• Interval timer (TM00 and TM01)
• External event counter (TM01 only)
• Square wave output (TM01 only)
The µ PD789800 Subseries is provided with a 1-channel (TM01) 8-bit timer/event counter and a 1-channel (TM00)
8-bit timer. When reading the description of TM00, "timer/event counter" should be read as " timer".
(1) 8-bit interval timer
When the 8-bit timer/event counter is used as an interval timer, it generates an interrupt at any preset time
interval.
Minimum Interval Time
(10.7 µ s)
6
2
/f
X
(85.3 µ s)
9
2
/f
X
Remarks 1. f
: System clock oscillation frequency
X
2. The parenthesized values apply to operation at f
Minimum Interval Time
(2.67 µ s)
4
2
/f
X
(42.7 µ s)
8
2
/f
X
Remarks 1. f
: System clock oscillation frequency
X
2. The parenthesized values apply to operation at f
(2) External event counter
The number of pulses of an externally input signal can be measured.
8-BIT TIMER/EVENT COUNTERS 00 AND 01
Table 6-1. Interval Time of 8-Bit Timer 00
Maximum Interval Time
14
2
/f
(2.73 ms)
X
17
2
/f
(21.8 ms)
X
Table 6-2. Interval Time of 8-Bit Timer/Event Counter 01
Maximum Interval Time
(682.7 µ s)
12
2
/f
X
16
2
/f
(10.9 ms)
X
User's Manual U12978EJ3V0UD
(10.7 µ s)
6
2
/f
X
(85.3 µ s)
9
2
/f
X
= 6.0 MHz.
X
(2.67 µ s)
4
2
/f
X
(42.7 µ s)
8
2
/f
X
= 6.0 MHz.
X
Resolution
Resolution
79
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