ST7LITE20F2 STMicroelectronics, ST7LITE20F2 Datasheet - Page 54

• Manufacturer Part Number: ST7LITE20F2
• Description: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI
• Manufacturer: STMicroelectronics

Specifications of ST7LITE20F2

• 8 Kbytes Single Voltage Flash Program Memory With Read-out Protection, In-circuit Programming And In-application Programming (icp And Iap). 10k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55˚C.
• Clock Sources: Internal 1% RC oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-Halt, Wait and Slow, Auto Wake Up From Halt

ST7LITE2
WATCHDOG TIMER (Cont’d)
11.1.5 Interrupts
None.
11.1.6 Register Description
CONTROL REGISTER (CR)
Read/Write
Reset Value: 0111 1111 (7Fh)
Bit 7 = WDGA Activation bit.
This bit is set by software and only cleared by
hardware after a reset.
Table 13. Watchdog Timer Register Map and Reset Values
54/133
1
WDGA
Address
002Eh
(Hex.)
7
T6
WDGCR
Reset Value
Register
Label
T5
T4
WDGA
T3
7
0
T2
T6
6
1
T1
T0
0
T5
5
1
When WDGA = 1, the watchdog can generate a
reset.
0: Watchdog disabled
1: Watchdog enabled
Note: This bit is not used if the hardware watch-
dog option is enabled by option byte.
Bits 6:0 = T[6:0] 7-bit timer (MSB to LSB).
These bits contain the decremented value. A reset
is produced when it rolls over from 40h to 3Fh (T6
becomes cleared).
T4
4
1
T3
3
1
T2
2
1
T1
1
1
T0
0
1