w77e58 Winbond Electronics Corp America, w77e58 Datasheet - Page 28

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w77e58

Manufacturer Part Number
w77e58
Description
8 Bit Microcontroller
Manufacturer
Winbond Electronics Corp America
Datasheet

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WTRF: Watchdog Timer Reset Flag. Hardware will set this bit when the watchdog timer causes a
EWT: Enable Watchdog timer Reset. Setting this bit will enable the Watchdog timer Reset function.
RWT: Reset Watchdog Timer. This bit helps in putting the watchdog timer into a know state. It also
The WDCON SFR is set to a 0x0x0xx0b on an external reset. WTRF is set to a 1 on a Watchdog
timer reset, but to a 0 on power on/down resets. WTRF is not altered by an external reset. POR is set
to 1 by a power-on reset. EWT is set to 0 on a Power-on reset and unaffected by other resets.
All the bits in this SFR have unrestricted read access. POR, EWT, WDIF and RWT require Timed
Access procedure to write. The remaining bits have unrestricted write accesses.
ACCUMULATOR
ACC.7-0:The A (or ACC) register is the standard 8052 accumulator.
EXTENDED INTERRUPT ENABLE
EIE.7-5:Reserved bits, will read high
EWDI: Enable Watchdog timer interrupt
EX5: External Interrupt 5 Enable.
EX4: External Interrupt 4 Enable.
EX3: External Interrupt 3 Enable.
EX2: External Interrupt 2 Enable.
reset. Software can read it but must clear it manually. A power-fail reset will also clear the bit.
This bit helps software in determining the cause of a reset. If EWT = 0, the watchdog timer
will have no affect on this bit.
helps in resetting the watchdog timer before a time-out occurs. Failing to set the EWT before
time-out will cause an interrupt, if EWDI (EIE.4) is set, and 512 clocks after that a watchdog
timer reset will be generated if EWT is set. This bit is self-clearing by hardware.
Mnemonic: ACC
Mnemonic: EIE
Bit:
Bit:
ACC.7
7
7
-
ACC.6
6
6
-
ACC.5
- 28 -
5
5
-
ACC.4
EWDI
4
4
ACC.3
Preliminary W77E58
EX5
3
3
Address: E0h
Address: E8h
ACC.2
EX4
2
2
ACC.1
EX3
1
1
ACC.0
EX2
0
0

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