IC89E54 Datasheet, PDF (6/36 Pages) Integrated Circuit Solution Inc – 8-BITS SINGLE MICROCONTROLLER with 16/32/64-Kbytes of FLASH, 256 byte +512 byte RAM

IC89E54/58/64
Table 1. Detailed Pin Description (continued)
Symbol PDIP
P3.0-P3.7 10-17
PLCC
11, 13-19
PQFP I/O
5, 7-13 I/O
10
11
11
13
12
14
5
I
7
O
8
I
13
15
9
I
14
16
10
I
15
17
11
I
16
18
12
O
17
19
13
O
P4.0-P4.3
23
17 I/O
34
29
1
39
12
6
12
6
1
39
RST
9
10
4
I
XTAL 2
18
20
14
O
XTAL 1
19
21
15
I
Name and Function
Port 3: Port 3 is an 8-bit bi-directional I/O port with internal
pullups. Port 3 pins that have 1s written to them are pulled high
by the internal pullups and can be used as inputs. As inputs, port
3 pins that are externally pulled low will source current because
of the internal pullups.
Port 3 also serves the special features of the IC89E54/58/64, as
listed below:
RxD (P3.0): Serial input port.
TxD (P3.1): Serial output port.
INT0 (P3.2): External interrupt. Serve as A14 during memory
program and verification.
INT1 (P3.3): External interrupt. Serve as A15 during memory
program and verification.
T0 (P3.4): Timer 0 external input.
T1 (P3.5): Timer 1 external input.
WR (P3.6):External data memory write strobe. Control signal
during memory program, verification and erase.
RD (P3.7): External data memory read strobe. Control signal
during memory program, verification and erase.
Port 4: In mode 0, Port 4 is an 8-bit bi-directional I/O port
with internal pullups. Port 4 pins that have 1s written to them are
pulled high by the internal pullups and can be used as inputs.
As inputs, port 4 pins that are externally pulled low will source
current because of the internal pullups.
In mode 1, 2, 3, Port 4 is an address strobe signal which appears
with RD or WR signals.
Port 4 also serves the special features, as listed below:
INT2 (P4.3): External interrupt
INT3 (P4.2): External interrupt
Reset: A high on this pin for two machine cycles while the
oscillator is running resets the device. An internal resistor to
VSS permits a power-on reset using only an external capacitor.
A small internal resistor permits power-on reset using only a
capacitor connected to VCC.
RST is an input control signal during memory program and
verification.
Crystal 2: Output from the inverting oscillator amplifier.
Crystal 1: Input to the inverting oscillator amplifier and input
to the internal clock generator circuits.
6
Integrated C ircuitSolution Inc.
MC012-0C 11/16/2001