W79E825A Datasheet, PDF (62/127 Pages) Winbond – 8-BIT MICROCONTROLLER

W79E825A/824A/823B/822B Data Sheet
The WDCON SFR bits are set/cleared in reset condition depending on the source of the reset.
External reset
Watchdog reset
Power on reset
WDCON
0x0x0xx0B
0x0x01x0B
01000000B
The WDCON SFR is set to a 0x00 0000B on the reset. WTRF (WDCON.2) is set to a 1 on a
Watchdog timer reset, but to a 0 on power on/down resets. WTRF (WDCON.2) is not altered by
external reset. EWRST (WDCON.1) is cleared by any reset. Software or any reset will clear
WDIF(WDCON.3) bit.
Some of the bits in the WDCON SFR (WDRUN, WDCLR, EWRST, WDIF, WD0 and WD1) have
unrestricted read access which required Timed Access procedure to write. The remaining bits have
unrestricted write accesses. Please refer TA register description.
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