uPD789074 Subseries 8-Bit Single-Chip Microcontrollers UD - Home

CHAPTER 7 8-BIT TIMER/EVENT COUNTER 807.1 Functions of 8-Bit Timer/Event Counter 808-bit timer/event counter 80 has the following functions.• Interval timer• External event counter• Square wave output• PWM output(1) 8-bit interval timerWhen 8-bit timer/event counter 80 is used as an interval timer, it generates an interrupt at a time interval setin advance.Table 7-1. Interval Time of 8-Bit Timer/Event Counter 80Minimum Interval Time Maximum Interval Time ResolutionAt fX = 10.0 MHzOperation NoteAt fX = 5.0 MHzOperationAt fX = 10.0 MHzOperation NoteAt fX = 5.0 MHzOperationAt fX = 10.0 MHzOperation NoteAt fX = 5.0 MHzOperation1/fX 100 ns 200 ns 2 8 /fX 25.6 µs 51.2 µs 1/fX 100 ns 200 ns2 8 /fX 25.6 µs 51.2 µs 2 16 /fX 6.55 ms 13.1 ms 2 8 /fX 25.6 µs 51.2 µsNote Expanded-specification products only.RemarkfX: System clock oscillation frequency(2) External event counterThe number of pulses of an externally input signal can be counted.(3) Square-wave outputA square-wave of arbitrary frequency can be output.Table 7-2. Square-Wave Output Range of 8-Bit Timer/Event Counter 80Minimum Pulse Width Maximum Pulse Width ResolutionAt fX = 10.0 MHzOperation NoteAt fX = 5.0 MHzOperationAt fX = 10.0 MHzOperation NoteAt fX = 5.0 MHzOperationAt fX = 10.0 MHzOperation NoteAt fX = 5.0 MHzOperation1/fX 100 ns 200 ns 2 8 /fX 25.6 µs 51.2 µs 1/fX 100 ns 200 ns2 8 /fX 25.6 µs 51.2 µs 2 16 /fX 6.55 ms 13.1 ms 2 8 /fX 25.6 µs 51.2 µsNote Expanded-specification products only.RemarkfX: System clock oscillation frequency(4) PWM output8-bit resolution PWM output can be produced.User’s Manual U14801EJ3V1UD 97