Pin Descriptions - Intel 80C51FA Specification Sheet

AUTOMOTIVE 80C51FA/83C51FA

PIN DESCRIPTIONS

: Supply voltage.
V
CC
: Circuit ground.
V
SS
Port 0: Port 0 is an 8-bit, open drain, bidirectional
I/O port. As an output port each pin can sink several
LS TTL inputs. Port 0 pins that have 1's written to
them float, and in that state can be used as high-im-
pedance 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 inter-
nal pullups when emitting1's, and can source and
sink several LS TTL inputs.
Port 0 outputs the code bytes during program verifi-
cation. External pullup resistors are required during
program verification.
Port 1: Port 1 is an 8-bit bidirectional I/O port with
internal pullups. The Port 1 output buffers can drive
LS TTL inputs. Port 1 pins that have 1's written to
them are pulled high by the internal pullups, and in
that state can be used as inputs. As inputs, Port 1
pins that are externally pulled low will source current
(I , on the datasheet) because of the internal pull-
IL
ups.
In addition, Port 1 serves the functions of the follow-
ing special features of the 83C51FA:
Pin (PDIP)
Diagrams are for pin reference only. Package sizes are not to scale.
4
Port Pin
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
Port 2: Port 2 is an 8-bit bidirectional I/O port with
internal pullups. The Port 2 output buffers can drive
LS TTL inputs. Port 2 pins that have 1's written to
them are pulled high by the internal pullups, and in
that state can be used as inputs. As inputs, Port 2
pins that are externally pulled low will source current
(I , on the datasheet) because of the internal pull-
IL
ups.
Port 2 emits the high-order address byte during
fetches from external Program Memory and during
accesses to external Data Memory that use 16-bit
addresses (MOVX
uses strong internal pullups when emitting 1's. Dur-
ing accesses to external Data Memory that use 8-bit
270501 ±3
Do not connect reserved pins.
Figure 3. Pin Connections
Alternate Function
T2 (External Count Input to Timer/
Counter 2)
T2EX (Timer/Counter 2 Capture/
Reload Trigger and Direction Control)
ECI (External Count Input to the PCA)
CEX0 (External I/O for Compare/
Capture Module 0)
CEX1 (External I/O for Compare/
Capture Module 1)
CEX2 (External I/O for Compare/
Capture Module 2)
CEX3 (External I/O for Compare/
Capture Module 3)
CEX4 (External I/O for Compare/
Capture Module 4)
DPTR). In this application it
Pad (PLCC)
270501 ±4