ST62T40B STMicroelectronics, ST62T40B Datasheet - Page 26

• Manufacturer Part Number: ST62T40B
• Description: 8-BIT OTP/EPROM MCU
• Manufacturer: STMicroelectronics

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ST62T40B/E40B
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
26/72
26
S
RSFF
RESET
Q
R
DB0
DB 1.7
8
WRITE
DATA BUS
-2
LOAD
7
RESET
SET
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.
SET
-2
8
OSCILLATOR
CLOCK
-12
VA00010