Philips P89LPC907 Computer Monitor User Manual


 
Philips Semiconductors
User’s Manual - Preliminary -
P89LPC906/907/908GENERAL DESCRIPTION
2003 Dec 8 12
PIN DESCRIPTIONS - P89LPC906
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.
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.
8I/OP0.4 Port 0 bit 4.
I CIN1A Comparator 1 positive input.
I KBI4 Keyboard Input 4.
7I/OP0.5 Port 0 bit 5.
I CMPREFComparator reference (negative) input.
I KBI5 Keyboard Input 5.
3I/OP0.6 Port 0 bit 6.
O CMP1 Comparator 1 output.
I KBI6 Keyboard Input 6.
P1.5 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.
P3.0 - P3.1 4,5 I/O Port 3 Port 3 is an I/O port with a user-configurable output types. During reset Port
3 latches are configured in the input only mode with the internal pullups
disabled. The operation of port 3 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.
All pins have Schmitt triggered inputs.
Port 3 also provides various special functions as described below:
5I/OP3.0 Port 3 bit 0.
O XTAL2 Output from the oscillator amplifier (when a crystal oscillator option is
selected via the FLASH configuration).
OCLKOUTCPU clock divided by 2 when enabled via SFR bit (ENCLK - TRIM.6). It can
be used if the CPU clock is the internal RC oscillator, watchdog oscillator or
external clock input, except when XTAL1/XTAL2 are used to generate clock
source for the Real-Time clock/system timer.
4I/OP3.1 Port 3 bit 1.
I XTAL1 Input to the oscillator circuit and internal clock generator circuits (when
selected via the FLASH configuration). It can be a port pin if internal RC
oscillator or watchdog oscillator is used as the CPU clock source, AND if
XTAL1/XTAL2 are not used to generate the clock for the Real-Time clock/
system timer.
V
SS
2IGround: 0V reference.
V
DD
6IPower Supply: This is the power supply voltage for normal operation as well as Idle and
Power down modes.