Philips P89LPC902 ユーザーズマニュアル

2003 Dec 8     

15

P0.0 - P0.6

2,6,7

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 on  I/O port 
configuration and the DC Electrical Characteristics in the 
Data Sheet 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.

2

I/O

Port 0 bit 2.

I

CIN2A Comparator 2 positive input.

I

Keyboard Input 2.

7

I/O

Port 0 bit 4.

I

CIN1A Comparator 1 positive input.

I

Keyboard Input 4.

  

6

I/O

Port 0 bit 5.

I

CMPREFComparator reference (negative) input.

I

Keyboard Input 5.

P1.0 - P1.5

3,4,5

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 on  I/O port configuration and the DC 
Electrical Characteristics in the Data Sheet for details. P1.5 
is input only.

All pins have Schmitt triggered inputs.
Port 1 also provides various special functions as described below.

5

I/O

Port 1 bit 0.

O

Serial port transmitter data.

3

I/O

Port 1 bit 1.

I

Serial port receiver data.

4

I

Port 1 bit 5. (Input only)

I

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.

V

SS

8

I

Ground: 0V reference. 

V

DD

1

I

Power Supply: This is the power supply voltage for normal operation as 
well as Idle and Power down modes.