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P89V51RB2BA
Philips Electronics
P89V51RB2BA Datasheet PDF : 77 Pages
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Philips Semiconductors
P89V51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
5.2 Pin description
Table 3:
Symbol
P0.0 to
P0.7
P1.0 to
P1.7
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
P89V51RB2/RC2/RD2 pin description
Pin
Type
Description
DIP40
TQFP44 PLCC44
39-32
37-30
43-36
I/O
Port 0: Port 0 is an 8-bit open drain bi-directional I/O
port. Port 0 pins that have ‘1’s written to them float, and
in this state can be used as high-impedance inputs.
Port 0 is also the multiplexed low-order address and
data bus during accesses to external code and data
memory. In this application, it uses strong internal
pull-ups when transitioning to ‘1’s. Port 0 also receives
the code bytes during the external host mode
programming, and outputs the code bytes during the
external host mode verification. External pull-ups are
required during program verification or as a general
purpose I/O port.
1-8
40-44, 1-3 2-9
I/O with
Port 1: Port 1 is an 8-bit bi-directional I/O port with
internal pull-up internal pull-ups. The Port 1 pins are pulled high by the
internal pull-ups when ‘1’s are written to them and can
be used as inputs in this state. As inputs, Port 1 pins that
are externally pulled LOW will source current (IIL)
because of the internal pull-ups. P1.5, P1.6, P1.7 have
high current drive of 16 mA. Port 1 also receives the
low-order address bytes during the external host mode
programming and verification.
1
40
2
I/O
T2: External count input to Timer/Counter 2 or Clock-out
from Timer/Counter 2
2
41
3
I
T2EX: Timer/Counter 2 capture/reload trigger and
direction control
3
42
4
I
ECI: External clock input. This signal is the external
clock input for the PCA.
4
43
5
I/O
CEX0: Capture/compare external I/O for PCA Module 0.
Each capture/compare module connects to a Port 1 pin
for external I/O. When not used by the PCA, this pin can
handle standard I/O.
5
44
6
I/O
SS: Slave port select input for SPI
CEX1: Capture/compare external I/O for PCA Module 1
6
1
7
I/O
MOSI: Master Output Slave Input for SPI
CEX2: Capture/compare external I/O for PCA Module 2
7
2
8
I/O
MISO: Master Input Slave Output for SPI
CEX3: Capture/compare external I/O for PCA Module 3
8
3
9
I/O
SCK: Master Output Slave Input for SPI
CEX4: Capture/compare external I/O for PCA Module 4
9397 750 14341
Product data
Rev. 03 — 02 December 2004
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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