gc80c590ae CORERIVER Semiconductor, gc80c590ae Datasheet - Page 27

• Manufacturer Part Number: gc80c590ae
• Description: Flash / Isp / Iap 8-bit Turbo Microcontrollers
• Manufacturer: CORERIVER Semiconductor

P0 (80h) : PORT 0 Register
R/W(1) R/W(1) R/W(1) R/W(1) R/W(1) R/W(1) R/W(1) R/W(1)
6.5. I/O Ports : PORT0[7:0]
P0.7
5V tolerant input and open-drain output in default condition (Intel 8052 compatible).
The output is fully driven (push-pull) when P0 drives address/data to access external RAM or PCA1 drives output
signals (C1EXn).
During access to external memory, P0 register will automatically be set to “FFh”.
Read-Modify-Write instructions do not read port pin but read SFR register.
An available alternative input functions when the corresponding SFR bit is “1” (PCA0 and PCA1 input pins).
PORT 0 Description
ANL
C1EX0(P0.0), C1EX1(P0.1), C1EX2(P0.2), C1EX3(P0.3), C1EX4(P0.4), C1EX5(P0.5), ECI1(P0.6), ECI0(P0.7)
P0.6
/
OPL
P0.5
/
XRL
Semiconductor Co., Ltd.
P0.4
/
JBC
P0.3
/
CPL
P0.2
/
INC
P0.1
External Address/Data or PCA1 output
/
P0.0
DEC
CPU BUS
/
DJNZ
/
P0.0
SFR
MOV PX.Y, C
QB
Q
Digital Input
External Access or PCA1 output
/
CLR PX.Y
MiDAS2.0 Family
/
1
0
SETB PX.Y
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P0.0