st62t65cm3 STMicroelectronics, st62t65cm3 Datasheet - Page 30

• Manufacturer Part Number: st62t65cm3
• Description: 8-bit Otp/eprom Mcus With A/d Converter, Safe Reset, Auto-reload Timer, Eeprom And Spi
• Manufacturer: STMicroelectronics

ST62T55C ST62T65C/E65C
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 19. Digital Watchdog Block Diagram
30/86
S
RSFF
RESET
Q
R
DB0
DB1.7
8
WRITE
DATA BUS
-2
LOAD
7
RESET
SET
Figure 18. A typical circuit making use of the
EXERNAL STOP MODE CONTROL feature
SWITCH
SET
-2
8
OSCILLATOR
CLOCK
-12
VA00010
NMI
I/O
VR02002