IC89E54 Datasheet, PDF (15/36 Pages) Integrated Circuit Solution Inc – 8-BITS SINGLE MICROCONTROLLER with 16/32/64-Kbytes of FLASH, 256 byte +512 byte RAM

IC89E54/58/64
P4(D8H) :
B7
Flag Name
-
Bit
Name
7-4 -
3
P4.3
2
P4.2
1
P4.1
0
P4.0
B6
B5
-
-
B4
B3
-
P4.3
Description
These bits are reserved.
Port 4 Data bit that output to pin P4.3 at mode 0.
Port 4 Data bit that output to pin P4.2 at mode 0.
Port 4 Data bit that output to pin P4.1 at mode 0.
Port 4 Data bit that output to pin P4.0 at mode 0.
B2
P4.2
B1
P4.1
B0
P4.0
P4.x
P4xCSINV
DATA OUTPUT
RD_CS
WRITE ENABLE
READ ENABLE
ADDRESS BUS
P4xAL
P4xAH
P4xCMP0
P4xCMP1
WR_CS
RD/WR_CS
P4xFUN0
P4xFUN1
INPUT SIGNAL
Figure 11. IC89E54/58/64 Port 4 Architecture
Integrated C ircuitSolution Inc.
MC012-0C 11/16/2001
PIN
P4.x
15