NEC NEC PD78081, User Manual

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CHAPTER 6 8-BIT TIMER/EVENT COUNTERS 5 AND 6
CHAPTER 6 8-BIT TIMER/EVENT COUNTERS 5 AND 6
The timers incorporated into the
µ
PD78083 subseries are outlined below.
(1) 8-bit timers/event counters 5 and 6 (TM5 and TM6)
This can be used to serve as an interval timer, an external event counter, square wave output with any selected
frequency PWM, etc. It cannot be used as a 16-bit timer/event counter (See CHAPTER 6 8-BIT TIMER/EVENT
COUNTERS 5 AND 6).
(2) Watchdog timer (WDTM)
WDTM can perform the watchdog timer function or generate non-maskable interrupt requests, maskable
interrupt requests and RESET at the preset time intervals (See CHAPTER 7 WATCHDOG TIMER).
(3) Clock output control circuit
This circuit supplies a clock obtained by dividing the main system clock, to other devices (See CHAPTER 8
CLOCK OUTPUT CONTROL CIRCUIT).
(4) Buzzer output control circuit
This circuit outputs the buzzer frequency obtained by dividing the main system clock (See CHAPTER 9
BUZZER OUTPUT CONTROL CIRCUIT).
Table 6-1 Timer/Event Counter Types and Functions
8-bit Timer/Event Counters 5 and 6 Watchdog Timer
Type Interval timer 2 channels 1 channel
Note
External event counter
√
—
Function Timer output
√
—
PWM output
√
—
Square-wave output
√
—
Interrupt request
√ √
Note Watchdog timer can perform either the watchdog timer function or the interval timer function.