Philips P89LPC908 用户手册
Philips Semiconductors
User’s Manual - Preliminary -
P89LPC906/907/908
GENERAL DESCRIPTION
13
PIN DESCRIPTIONS - P89LPC907
Mnemonic
Pin no.
Type Name and function
P0.4 - P0.6
3, 7,8
I/O
Port 0: Port 0 is an I/O port with a user-configurable output types. During reset Port
0 latches are configured in the input only mode with the internal pullup
disabled. 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 Port Configurations on page 35 and the DC Electrical
Characteristics in the datasheet for details.
disabled. 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 Port Configurations on page 35 and the DC Electrical
Characteristics in the datasheet for details.
The Keypad Interrupt feature operates with port 0 pins.
All pins have Schmitt triggered inputs.
Port 0 also provides various special functions as described below.
All pins have Schmitt triggered inputs.
Port 0 also provides various special functions as described below.
8
I/O
P0.4
Port 0 bit 4.
I
CIN1A Comparator 1 positive input.
I
KBI4
Keyboard Input 4.
7
I/O
P0.5
Port 0 bit 5.
I
CMPREFComparator reference (negative) input.
I
KBI5
Keyboard Input 5.
3
I/O
P0.6
Port 0 bit 6.
O
CMP1
Comparator 1 output.
I
KBI6
Keyboard Input 6.
P1.0-P1.5
1,4,5
Port 1: Port 1 is an I/O port with a user-configurable output types. During reset Port
1 latches are configured in the input only mode with the internal pull-up
disabled. 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
Port Configurations on page 35 and the DC Electrical Characteristics in the
datasheet for details.
disabled. 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
Port Configurations on page 35 and the DC Electrical Characteristics in the
datasheet for details.
P1.5 is input only.
All pins have Schmitt triggered inputs.
Port 1 also provides various special functions as described below.
All pins have Schmitt triggered inputs.
Port 1 also provides various special functions as described below.
5
I/O
P1.0
Port 1 bit 0.
O
TxD
Serial port transmitter data.
4
I/O
P1.2
Port 1 bit 2.
I/O
T0
Timer 0 external clock input, toggle output, PWM output.
1
I
P1.5
Port 1 bit 5. (Input only)
I
RST
External Reset input during power-on or if selected via UCFG1. When
functioning as a reset input 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. Also used during a power-on
sequence to force In-Circuit Programming mode.
functioning as a reset input 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. Also used during a power-on
sequence to force In-Circuit Programming mode.
V
SS
2
I
Ground: 0V reference.
V
DD
6
I
Power Supply: This is the power supply voltage for normal operation as well as Idle
and Power down modes.
and Power down modes.