ST72121J4 查看數據表（PDF） - STMicroelectronics

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ST72121J4

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

STMicroelectronics 

ST72E121 ST72T121

1.5 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.

OPTBYTE

7

-

-

-

- b3 b2

Bit 7:4 = Not used

Bit 3 = Reserved, must be cleared.

0

- WDG

Bit 2 = Reserved, must be set on ST72T121N de-

vices and must be cleared on ST72T121J devices.

Bit 1 = Not used

Bit 0 = WDG Watchdog disable

0: The Watchdog is enabled after reset (Hardware

Watchdog).

1: The Watchdog is not enabled after reset (Soft-

ware Watchdog).

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