W77LE58_07 Datasheet, PDF (25/82 Pages) Winbond – 8-BIT MICROCONTROLLER

W77LE58/W77L058A
Accumulator
Bit:
7
6
5
4
3
2
1
0
ACC.7 ACC.6 ACC.5 ACC.4 ACC.3 ACC.2 ACC.1 ACC.0
Mnemonic: ACC
ACC.7-0: The A (or ACC) register is the standard 8052 accumulator.
Address: E0h
Extended Interrupt Enable
Bit:
7
6
-
-
Mnemonic: EIE
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.
5
4
3
2
1
0
-
EWDI EX5 EX4 EX3 EX2
Address: E8h
B Register
Bit:
7
6
5
4
3
2
1
0
B.7
B.6
B.5
B.4
B.3
B.2
B.1
B.0
Mnemonic: B
Address: F0h
B.7-0:The B register is the standard 8052 register that serves as a second accumulator.
Exterded Interrupt Priority
Bit:
7
6
5
4
3
2
1
0
-
-
-
PWDI PX5 PX4 PX3 PX2
Mnemonic: EIP
EIP.7-5: Reserved bits.
PWDI: Watchdog timer interrupt priority.
PX5: External Interrupt 5 Priority. 0 = Low priority, 1 = High priority.
PX4: External Interrupt 4 Priority. 0 = Low priority, 1 = High priority.
PX3: External Interrupt 3 Priority. 0 = Low priority, 1 = High priority.
PX2: External Interrupt 2 Priority. 0 = Low priority, 1 = High priority.
Address: F8h
6.1 Instruction
The W77L058 executes all the instructions of the standard 8032 family. The operation of these
instructions, their effect on the flag bits and the status bits is exactly the same. However, timing of
these instructions is different. The reason for this is two fold. Firstly, in the W77L058, each machine
cycle consists of 4 clock periods, while in the standard 8032 it consists of 12 clock periods. Also, in the
W77L058 there is only one fetch per machine cycle i.e. 4 clocks per fetch, while in the standard 8032
there can be two fetches per machine cycle, which works out to 6 clocks per fetch.
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Publication Release Date: February 1, 2007
Revision A7