p87c591vfb NXP Semiconductors, p87c591vfb Datasheet - Page 9

• Manufacturer Part Number: p87c591vfb
• Description: Single-chip 8-bit Microcontroller With Can Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
6.2
Table 1 Pin description for QFP44/PLCC44, see Note 1.
2000 Jul 26
RST
P3.0to P3.7
P3.0/RXD
P3.1/TXD
P3.2/INT0/CMSR0 8
P3.3/INT1/
CMSR1
P3.4/T0/CMSR2
P3.5/T1/CMSR3
P3.6/WR
P3.7/RD
XTAL2
XTAL1
V
V
SS
DD
Single-chip 8-bit microcontroller with CAN controller
SYMBOL
Pin description
4
5
7
9
10
11
12
13
14
15
16
17
QFP44 PLCC44
PIN
10
11
13
14
15
16
17
18
19
20
21
22
23
Reset: A Input to reset the P8xC591. It also provides a reset pulse as output
when Timer T3 overflows.
Port 3 (P3.0 to P3.7): 8-bit programmable I/O port lines; Port 3 can
sink/source 4 LSTTL inputs.
Port 3 pins serve alternate functions as follows:
RXD: Serial input port for UART;
T2: T2 event input
TXD: Serial output port for UART;
RT2: T2 timer reset signal. Rising edge triggered.
INT0: External interrupt input 0;
CMSR0: Compare and Set/Reset output for Timer T2.
INT1: External interrupt input 1;
CMSR1: Compare and Set/Reset output for Timer T2.
T0: Timer 0 external interrupt input;
CMSR2: Compare and Set/Reset output for Timer T2.
T1: Timer 1 external interrupt input;
CMSR3: Compare and Set/Reset output for Timer T2.
WR: External Data Memory Write strobe;
RD: External Data Memory Read strobe.
During reset, Port 3 will be asynchronously driven resistive HIGH.
Port 3 has four modes selected on a per bit basis by writing to the P3M1 and
P3M2 registers as follows:
P3M1.x
Crystal pin 2: output of the inverting amplifier that forms the oscillator. Left
open-circuit when an external oscillator clock is used.
Crystal pin 1: input to the inverting amplifier that forms the oscillator, and
input to the internal clock generator. Receives the external oscillator clock
signal when an external oscillator is used.
Ground; circuit ground potential.
Power supply; power supply pin during normal operation and power
reduction modes.
0
0
1
1
P3M2.x
0
1
0
1
9
Mode Description
Pseudo-bidirectional (standard c51 configuration default)
Push-Pull
High impedance
Open drain
DESCRIPTION
Preliminary Specification
P8xC591