ST62P20CL3 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST62P20CL3

8-BIT OTP/EPROM MCUs WITH A/D CONVERTER, OSCILLATOR SAFEGUARD, SAFE RESET AND 20 PINS

STMicroelectronics 

ST62T08C/T09C ST62T10C/T20C/E20C

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

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.

Figure 18. A typical circuit making use of the

EXERNAL STOP MODE CONTROL feature

SWITCH

NMI

I/O

Figure 19. Digital Watchdog Block Diagram

RESET

VR02002

Q

RSFF

S

R

-27

DB1.7 LOAD SET

DB0

8

WRITE

RESET

DATA BUS

-2 8

SET

-12

OSCILLATOR

CLOCK

VA00010

25/70

113

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