HD64F2145 datasheet(367/829 Pages) RENESAS

Part #	HD64F2145

Description	Hitachi 16-Bit Single-Chip Microcomputer

PDF	829 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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367 / 829 page

Rev. 2.0, 08/02, page 327 of 788

14.2

Input/Output Pins

The WDT has the pins listed in table 14.1.

Table 14.1

Pin Configuration

Name

Symbol

I/O

Function

Reset output pin

5(62

Output

Outputs the counter overflow signal in

watchdog timer mode

External sub-clock

input pin

EXCL

Input

Inputs the clock pulses to the WDT_1

prescaler counter

14.3

The WDT has the following registers. To prevent accidental overwriting, TCSR and TCNT have

to be written to in a method different from normal registers. For details, refer to section 14.6.1,

Notes on Register Access. For details on the system control register, refer to section 3.2.2, System

Control Register (SYSCR).

• Timer counter (TCNT)

• Timer control/status register (TCSR)

14.3.1

Timer Counter (TCNT)

TCNT is an 8-bit readable/writable up-counter.

TCNT is initialized to H'00 when the TME bit in the timer control/status register (TCSR) is

cleared to 0.

HD64F2145 Datasheet(PDF) 367 Page - Renesas Technology Corp