SH7041A datasheet(493/923 Pages) RENESAS

Part #	SH7041A

Description	Renesas 32-Bit Single-Chip RISC Microprocessor SuperH RISC engine Family/SH7040 Series(CPU Core SH-2)

PDF	923 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

Logo

493 / 923 page

455

Section 13 Watchdog Timer (WDT)

13.1

Overview

The watchdog timer (WDT) is a 1-channel timer for monitoring system operations. If a system

encounters a problem (crashes, for example) and the timer counter overflows without being

rewritten correctly by the CPU, an overflow signal (

WDTOVF) is output externally. The WDT

can simultaneously generate an internal reset signal for the entire chip.

When the watchdog function is not needed, the WDT can be used as an interval timer. In the

interval timer operation, an interval timer interrupt is generated at each counter overflow. The

WDT is also used in recovering from the standby mode.

13.1.1

Features

• Works in watchdog timer mode or interval timer mode.

• Outputs WDTOVF in the watchdog timer mode. When the counter overflows in the watchdog

timer mode, overflow signal

WDTOVF is output externally. You can select whether to reset

the chip internally when this happens. Either the power-on reset or manual reset signal can be

selected as the internal reset signal.

• Generates interrupts in the interval timer mode. When the counter overflows, it generates an

interval timer interrupt.

• Clears standby mode.

• Works with eight counter input clocks.

SH7041A Datasheet(PDF) 493 Page - Renesas Technology Corp