UPD17217GT datasheet(36/84 Pages) NEC

Part #	UPD17217GT

Description	4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER

PDF	84 Pages

Scroll/Zoom	100%

Manufacturer	NEC [NEC]

Direct Link	http://www.nec.com/

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36 / 84 page

µPD17215, 17216, 17217, 17218

BASIC INTERVAL TIMER/WATCHDOG TIMER

The basic interval timer has a function to generate the interval timer interrupt signal and watchdog timer reset signal.

6.1

Source Clock for Basic Interval Timer

The system clock (fx) is divided, to generate the source clock for the basic interval timer. The input clock frequency for

the basic interval timer is fx/2

7. When the CPU is set in the STOP mode, the basic interval timer also stops.

6.2

Controlling Basic Interval Timer

The basic interval timer is controlled by the bits on the register file. That is, the basic interval timer is reset by BTMRES.

The frequency for the interrupt signal, output by the basic interval timer, is selected by BTMMD, and the watchdog timer is

reset by WDTRES.

Fig. 6-1

Basic Interval Timer Configuration

System

clock f X

1/2

divider

1/2

divider

1/2

divider

1/2

divider

1/2

divider

BTMRES

WDTRES

BTMCK

IRQBTM

WDOUT

f /2

UPD17217GT Datasheet(PDF) 36 Page - NEC