ST72311 datasheet(12/94 Pages) STMICROELECTRONICS

Teilenummer	ST72311

Bauteilbeschribung	8-BIT MCU WITH 8 TO 16K ROM/OTP/EPROM, 384 TO 512 BYTES RAM, ADC, WDG, SCI, SPI AND 2 TIMERS

PDF	94 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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ST72311

1.4 OPTION BYTE

The user has the option to select software watch-

dog or hardware watchdog (see description in the

Watchdog chapter). When programming EPROM

or OTP devices, this option is selected in a menu

by the user of the EPROM programmer before

burning the EPROM/OTP. The Option Byte is lo-

cated in a non-user map. No address has to be

specified. The Option Byte is at FFh after UV eras-

ure and must be properly programmed to set de-

sired options.

For ROM devices, the option (software or hard-

ware watchdog) must be specified in the option list

provided to STMicroelectronics with the ROM

code (see ordering information). The Option Byte

is hardware programmed as the ROM content.

b7-4 = Not Used

b3 = Reserved, must be cleared to 0

b2 = Reserved, must be set to 1 on ST72311N de-

vices and must be cleared to 0 on ST72311J de-

vices.

b1 = Not Used

b0 = WDG Watchdog disable

If set to 1 the Watchdog is not enabled after reset

(Software Watchdog).

If set to 0 the Watchdog is enabled after reset

(Hardware Watchdog).

WDG

ST72311 Datenblatt(PDF) 12 Page - STMicroelectronics