IC89E54 Datasheet, PDF (5/36 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
Symbol PDIP
P0.0-P0.7 39-32
PLCC
43-36
PQFP I/O
37-30 I/O
P1.0-P1.7 1-8
2-9
40-44 I/O
P2.0-P2.7
1
2
21-28
2
3
24-31
40
I
41
I
18-25 I/O
Name and Function
Port 0: Port 0 is an open-drain, bi-directional I/O port. Port 0 pins
that have 1s written to them float and can be used as high-
impedance inputs. Port 0 is also the multiplexed low-order
address and data bus during accesses to external program and
data memory. In this application, it uses strong internal pullups
when emitting 1s.
Port 0 also receives the command and code bytes during
memory program and verification, and outputs the code bytes
during program verification. External pullups are required during
program verification.
Port 1: Port 1 is an 8-bit bi-directional I/O port with internal
pullups. Port 1 pins that have 1s written to them are pulled high
by the internal pullups and can be used as inputs. As inputs, port
1 pins that are externally pulled low will source current because
of the internal pullups.
Port 1 also receives the low-order address byte during memory
program and verification.
T2(P1.0) : Timer/counter 2 external count input.
T2EX(P1.1): Timer/counter 2 trigger input.
Port 2: Port 2 is an 8-bit bi-directional I/O port with internal
pullups. Port 2 pins that have 1s written to them are pulled high
by the internal pull-ups and can be used as inputs. As inputs,
port 2 pins that are externally pulled low will source current
because of the internal pullups. Port 2 emits the high order
address byte during fetches from external program memory and
during accesses to external data memory that used 16-bit
addresses. In this application, it uses strong internal pullups
when emitting 1s. During accesses to external data memory that
use 8-bit addresses, port 2 emits the contents of the P2 special
function register.
Port 2 also receives the high-order address bits from A13 to A8
and some control signals during Flash programming and
verification. P2.6, P2.7 are the control signals while the chip
programs and erases. P2.6 is a program command strobe
signal. P2.7 is a data output enable signal.
Integrated C ircuitSolution Inc.
5
MC012-0C 11/16/2001