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

IC89E54/58/64
P2ECON(AEH)
B7
B6
B5
B4
B3
Flag Name P43CSINV P42CSINV P41CSINV P40CSINV
-
B2
B1
B0
-
P2CN1 P2CN0
Bit
Name
Description
7
P43CSINV
The active polarity of P4.3 when pin P4.3 is defined as read/write strobe signal.
=1: P4.3 is active high when pin P4.3 is defined as read/write strobe signal.
=0: P4.3 is active low when pin P4.3 is defined as read/write strobe signal.
6
P42CSINV
The similarity definition as P43SINV.
5
P41CSINV
The similarity definition as P43SINV.
4
P40CSINV
The similarity definition as P43SINV.
3,2
-
Reserve
1,0
P2CN1,
=00 : Pin P2.7-P2.0 is the standard 8052 port 2.
P2CN0
=01 : Pins P2.7-P2.0 is input buffer port which the port enable address depends on the content
of P2EAL and P2EAH.
=10 : Pins P2.7-P2.0 is output-latched port which the port enable address depends on the
content of P2EAL and P2EAH.
=11 : Undefined.
PORT 2 OUTPUT DATA BUS
INTERNAL DATA BUS
WRITE
74373
ADDRESS BUS
P2EAL
P2EAH
READ
P2CN1
P2CN0
74244
PORT 2 INPUT DATA BUS
MUX
DEMUX
PORT 2
Figure 12. IC89E54/58/64 Port 2 Architecture
16
Integrated C ircuitSolution Inc.
MC012-0C 11/16/2001