ST62P45BQ1 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST62P45BQ1

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

STMicroelectronics 

ST62T45B/E45B

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

should load the watchdog counter within the first

Figure 15. Digital Watchdog Block Diagram

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

R SF F

S

R

-27

DB1.7 LOAD SET

DB0

8

WRITE

RESET

DATA BUS

-2 8

SET

-12

OSCILLATOR

CLOCK

VA 000 10

26/72

25

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