ST7260E1 STMicroelectronics, ST7260E1 Datasheet - Page 45

• Manufacturer Part Number: ST7260E1
• Description: LOW SPEED USB 8-BIT MCU FAMILY WITH UP TO 8K FLASH/ROM AND SERIAL COMMUNICATION INTERFACE (SCI)
• Manufacturer: STMicroelectronics

Specifications of ST7260E1

• 4 Or 8 Kbytes Program Memory: high density Flash (HDFlash), or FastROM with readout and write protection

ST7260xx
Note:
12.3.1
12.3.2
1
2
Figure 23. Watchdog block diagram
Table 23.
Following a reset, the watchdog is disabled. Once activated it cannot be disabled, except by
a reset.
The T6 bit can be used to generate a software reset (the WDGA bit is set and the T6 bit is
cleared).
Software watchdog option
If Software Watchdog is selected by option byte, the watchdog is disabled following a reset.
Once activated it cannot be disabled, except by a reset.
The T6 bit can be used to generate a software reset (the WDGA bit is set and the T6 bit is
cleared).
Hardware watchdog option
If Hardware Watchdog is selected by option byte, the watchdog is always active and the
WDGA bit in the CR is not used.
Max
Min
f
CPU
Watchdog timing (f
WDGA
RESET
CR register initial value
T6
FFh
C0h
CPU
T5
WATCHDOG CONTROL REGISTER (CR)
7-BIT DOWNCOUNTER
= 8 MHz)
CLOCK DIVIDER
T4
÷49152
T3
T2
WDG timeout period (ms)
T1
Watchdog timer (WDG)
393.216
T0
6.144
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