ST6246 データシートの表示（PDF） - STMicroelectronics

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ST6246

8-BIT OTP/EPROM MCU WITH LCD DRIVER, EEPROM AND A/D CONVERTER

STMicroelectronics 

ST62T46B/E46B

DIGITAL WATCHDOG (Cont’d)

These instructions test the C bit and Reset the

MCU (i.e. disable the Watchdog) if the bit is set

(i.e. if the Watchdog is active), thus disabling the

Watchdog.

In all modes, a minimum of 28 instructions are ex-

ecuted after activation, before the Watchdog can

generate a Reset. Consequently, user software

Figure 15. Digital Watchdog Block Diagram

should load the watchdog counter within the first

27 instructions following Watchdog activation

(software mode), or within the first 27 instructions

executed following a Reset (hardware activation).

It should be noted that when the GEN bit is low (in-

terrupts disabled), the NMI interrupt is active but

cannot cause a wake up from STOP/WAIT modes.

RESET

Q

RSFF

S

R

-27

DB1.7 LOAD SET

DB0

8

WRITE

RESET

DATA BUS

-28

SET

-12

OSCILLATOR

CLOCK

V A00 010

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