W925EP01 Datasheet, PDF (24/108 Pages) Winbond – 8-BIT CID MICROCONTROLLER

W925EP01/ W925EP01FG
P2.7-0: Port 2 is an I/O port with internal pull-high resistor. P2 can be selected as input or output
mode by the P2IO register. At initial reset, P2 is used as input mode. When P2IO is set to 0,
P2 is used as CMOS output mode.
HIGH BYTE REGISTER
(initial=00H)
Bit:
7
6
5
4
3
2
1
0
HB.7 HB.6 HB.5 HB.4 HB.3 HB.2 HB.1 HB.0
Mnemonic: HB
Address: A1h
This register contains the high byte address during execution of " MOVX @Ri, " instructions.
P4 PULL-HIGH CONTROL
(initial=00H)
Bit:
7
6
5
4
3
2
1
0
P4.7H P4.6H P4.5H P4.4H P4.3H P4.2H P4.1H P4.0H
P4H:
Mnemonic: P4H
Port4 pins pull-high resistor enable/disable
1: enable
0: disable
Address: A2h
P5 PULL-HIGH CONTROL
(initial=00H)
Bit:
7
6
5
4
3
2
1
0
P5.7H P5.6H P5.5H P5.4H P5.3H P5.2H P5.1H P5.0H
P5H:
Mnemonic: P5H
Port5 pins pull-high resistor enable/disable
1: enable
0: disable
Address: A3h
PORT 7
(initial=FFH)
Bit:
7
6
5
4
3
2
1
0
P7.7 P7.6 P7.5 P7.4 P7.3 P7.2 P7.1 P7.0
Mnemonic: P7
Address: A4h
P7.7-0: Port 7 is an I/O port with internal pull-high resistor. P7 can be selected as input or output
mode by the P7IO register, at initial reset, P7IO is set to 1, P7 is used as input mode. When
P7IO is set to 0, P7 is used as CMOS output mode.
The special function of P7 is as data bus of external program ROM or external data RAM.
The program memory on the standard 8052 can only be addressed to 64KB long. W925EP01
can extend to two 64KB program ROM banks; there are on-chip APROM bank and external
program ROM bank. When PG=1, the P7 pins can be treated as data bus of external program
ROM. When PG=0, the P7 pins can be treated as normal I/O.
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