NEC PD78212, PD78213, PD78214, PD78P214 7.4 8-BIT TIMER/COUNTER 3 7.4.1 Functions, 7.4.2 Configuration

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Chapter 7 Timer/Counter Units
7
7.4 8-BIT TIMER/COUNTER 3
7.4.1 Functions
Eight-bit timer/counter 3 can be used as an interval timer, and also as a counter for generating a clock signal used
with the baud rate generator.
When operating as an interval timer, 8-bit timer/counter 3 generates an internal interrupt at specified intervals.
Table 7-19 indicates the interval setting range.
Table 7-19 Intervals of 8-Bit Timer/Counter 3
Resolution
8/fCLK (1.3
µ s)
16/fCLK (2.6 µ s)
32/fCLK (5.3
µ s)
64/fCLK (10.7
µ s)
128/fCLK (21.3 µ s)
256/fCLK (42.7 µ s)
512/fCLK (85.3 µ s)
Maximum interval
28 × 8/fCLK (341 µ s)
28 × 16/fCLK (683 µ s)
28 × 32/fCLK (1.37 ms)
28 × 64/fCLK (2.73 ms)
28 × 128/fCLK (5.46 ms)
28 × 256/fCLK (10.9 ms)
28 × 512/fCLK (21.8 ms)
Minimum interval
8/fCLK (1.3
µ s)
16/fCLK (2.6 µ s)
32/fCLK (5.3
µ s)
64/fCLK (10.7
µ s)
128/fCLK (21.3 µ s)
256/fCLK (42.7 µ s)
512/fCLK (85.3 µ s)
The values in parentheses are based on fCLK = 6 MHz.
7.4.2 Configuration
Eight-bit timer/counter 3 consists of one 8-bit timer 3 (TM3) and one 8-bit compare register (CR30).
Fig. 7-122 shows the block diagram of 8-bit timer/counter 3.