Philips P89LPC908, P89LPC907 user manual PIN Descriptions P89LPC906

Philips Semiconductors					User’s Manual - Preliminary -
GENERAL DESCRIPTION					P89LPC906/907/908
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.
	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.
P1.5	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:
	5	I/O	P3.0	Port 3 bit 0.
		O	XTAL2 Output from the oscillator amplifier (when a crystal oscillator option is
				selected via the FLASH configuration).
		O	CLKOUTCPU 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.
	4	I/O	P3.1	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.
VSS	2	I	Ground: 0V reference.
VDD	6	I	Power Supply: This is the power supply voltage for normal operation as well as Idle and
			Power down modes.

2003 Dec 8 12