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P87LPC764 Datasheet(PDF) 7 Page - NXP Semiconductors

Part No. P87LPC764
Description  Low power, low price, low pin count (20 pin) microcontroller with 4 kbyte OTP
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

P87LPC764 Datasheet(HTML) 7 Page - NXP Semiconductors

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Product data
P87LPC764
Low power, low price, low pin count (20 pin)
microcontroller with 4 kbyte OTP
2003 Sep 03
6
PIN DESCRIPTIONS
MNEMONIC
PIN NO.
TYPE
NAME AND FUNCTION
P0.0–P0.7
1, 13, 14,
16–20
I/O
Port 0: Port 0 is an 8-bit I/O port with a user-configurable output type. Port 0 latches are configured in
the quasi-bidirectional mode and have either ones or zeros written to them during reset, as determined
by the PRHI bit in the UCFG1 configuration byte. The operation of port 0 pins as inputs and outputs
depends upon the port configuration selected. Each port pin is configured independently. Refer to the
section on I/O port configuration and the DC Electrical Characteristics for details.
The Keyboard Interrupt feature operates with port 0 pins.
Port 0 also provides various special functions as described below.
1
O
P0.0
CMP2
Comparator 2 output.
20
I
P0.1
CIN2B
Comparator 2 positive input B.
19
I
P0.2
CIN2A
Comparator 2 positive input A.
18
I
P0.3
CIN1B
Comparator 1 positive input B.
17
I
P0.4
CIN1A
Comparator 1 positive input A.
16
I
P0.5
CMPREF
Comparator reference (negative) input.
14
O
P0.6
CMP1
Comparator 1 output.
13
I/O
P0.7
T1
Timer/counter 1 external count input or overflow output.
P1.0–P1.7
2–4, 8–12
I/O
Port 1: Port 1 is an 8-bit I/O port with a user-configurable output type, except for three pins as noted
below. Port 1 latches are configured in the quasi-bidirectional mode and have either ones or zeros
written to them during reset, as determined by the PRHI bit in the UCFG1 configuration byte. The
operation of the configurable port 1 pins as inputs and outputs depends upon the port configuration
selected. Each of the configurable port pins are programmed independently. Refer to the section on I/O
port configuration and the DC Electrical Characteristics for details.
Port 1 also provides various special functions as described below.
12
O
P1.0
TxD
Transmitter output for the serial port.
11
I
P1.1
RxD
Receiver input for the serial port.
10
I/O
I/O
P1.2
T0
Timer/counter 0 external count input or overflow output.
SCL
I2C serial clock input/output. When configured as an output, P1.2 is open
drain, in order to conform to I2C specifications.
9
I
I/O
P1.3
INT0
External interrupt 0 input.
SDA
I2C serial data input/output. When configured as an output, P1.3 is open
drain, in order to conform to I2C specifications.
8
I
P1.4
INT1
External interrupt 1 input.
4
I
P1.5
RST
External Reset input (if selected via EPROM configuration). A low on this pin
resets the microcontroller, causing I/O ports and peripherals to take on their
default states, and the processor begins execution at address 0. When used
as a port pin, P1.5 is a Schmitt trigger input only.
P2.0–P2.1
6, 7
I/O
Port 2: Port 2 is a 2-bit I/O port with a user-configurable output type. Port 2 latches are configured in the
quasi-bidirectional mode and have either ones or zeros written to them during reset, as determined by
the PRHI bit in the UCFG1 configuration byte. The operation of port 2 pins as inputs and outputs
depends upon the port configuration selected. Each port pin is configured independently. Refer to the
section on I/O port configuration and the DC Electrical Characteristics for details.
Port 2 also provides various special functions as described below.
7
O
P2.0
X2
Output from the oscillator amplifier (when a crystal oscillator option is
selected via the EPROM configuration).
CLKOUT
CPU clock divided by 6 clock output when enabled via SFR bit and in
conjunction with internal RC oscillator or external clock input.
6
I
P2.1
X1
Input to the oscillator circuit and internal clock generator circuits (when
selected via the EPROM configuration).
VSS
5
I
Ground: 0V reference.
VDD
15
I
Power Supply: This is the power supply voltage for normal operation as well as Idle and
Power Down modes.


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