Functions; Intervals Of 8-Bit Timer/Counter 2 - NEC PD78212 User Manual

7.3 8-BIT TIMER/COUNTER 2

7.3.1 Functions

Eight-bit timer/counter 2 has two functions not available with the other three timers/counters:
• External event counter
• One-shot timer
This section describes the following four basic functions in sequence:
• Interval timer
• Programmable square wave output
• Pulse width measurement
• External event counter
(1) Interval timer
When operating as an interval timer, 8-bit timer/counter 2 generates an internal interrupt at specified intervals.
Table 7-11 Intervals of 8-Bit Timer/Counter 2
Resolution Minimum interval
16/f 16/f
CLK
(2.6 µ s) (2.6 µ s)
32/f 32/f
CLK
(5.3 µ s) (5.3 µ s)
64/f 64/f
CLK
(10.7 µ s) (10.7 µ s)
128/f 128/f
CLK
(21.3 µ s) (21.3 µ s)
256/f 256/f
CLK
(42.7 µ s) (42.7 µ s)
512/f 512/f
CLK
(85.3 µ s) (85.3 µ s)
The values in parentheses are based on f
Chapter 7 Timer/Counter Units
Maximum interval
× 16/f
8
2
CLK
(683 µ s)
× 32/f
8
2
CLK
(1.37 ms)
× 64/f
2 8
CLK
(2.73 ms)
× 128/f
8
2
CLK
(5.46 ms)
× 256/f
8
2
CLK
(10.9 ms)
× 512/f
8
2
CLK
(21.8 ms)
CLK
CLK
CLK
CLK
CLK
CLK
= 6 MHz.
CLK
7
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