UPD75112F datasheet(21/78 Pages) NEC

21 / 78 page

µPD75108,75112F,75116F

5.4

BASIC INTERVAL TIMER

The basic interval timer includes the following functions.

• It operates as an interval timer which generates reference time interrupts.

• It can be applied as a watchdog timer which detects when a program is out of control.

• Selects and counts wait times when the standby mode is released.

• It reads count contents.

Fig. 5-3 Basic Interval Timer Configuration

Remarks

* indicates instruction execution.

Internal Bus

fXX/2

From Clock

Generator

BTM3

BTM2

BTM1

BTM0

BTM

MPX

IRQBT

Set

BT Interrupt

Request Flag

Clear

Basic Interval Timer

(8-Bit Frequency Divider)

Wait Release

Signal during

Standby Release

Vector

Interrupt

Request

Signal

fXX/2

*SET1

5.5

TIMER/EVENT COUNTER

The

µPD75116F incorporates two internal timer/event counter channels.

Timer/event counter channel 0 and channel 1 differ only in selectable count pulse (CP) and clock supply function

to serial interface and are the same in other configurations and functions.

The functions of the timer/event counter are as follows.

• Operates as a programmable interval timer.

• Outputs square waves in the desired frequency to the PTOn pin.

• Operates as an event counter.

• Use of TIn pin as an external interrupt input pin.

• Divides the TIn pin input into N divisions and outputs it to the PTOn pin (frequency divider operation).

• Supplies a serial shift clock to the serial interface circuit. (channel 0 only)

• Count status read function.

UPD75112F 数据表(PDF) 21 Page - NEC

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