Philips Semiconductors
User’s Manual - Preliminary -
P89LPC906/907/908
GENERAL 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.
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
CMPREF
Comparator 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
CLKOUT
CPU 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.
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.
Содержание P89LPC906
Страница 30: ...Philips Semiconductors User s Manual Preliminary P89LPC906 907 908 CLOCKS 2003 Dec 8 30 ...
Страница 34: ...Philips Semiconductors User s Manual Preliminary P89LPC906 907 908 INTERRUPTS 2003 Dec 8 34 ...
Страница 40: ...Philips Semiconductors User s Manual Preliminary P89LPC906 907 908 I O PORTS 2003 Dec 8 40 ...
Страница 46: ...Philips Semiconductors User s Manual Preliminary P89LPC906 907 908 TIMERS 0 AND 1 2003 Dec 8 46 ...
Страница 52: ...Philips Semiconductors User s Manual Preliminary P89LPC906 907 908 REAL TIME CLOCK SYSTEM TIMER 2003 Dec 8 52 ...
Страница 58: ...Philips Semiconductors User s Manual Preliminary P89LPC906 907 908 POWER MONITORING FUNCTIONS 2003 Dec 8 58 ...
Страница 70: ...Philips Semiconductors User s Manual Preliminary P89LPC906 907 908 UART 2003 Dec 8 70 ...
Страница 76: ...Philips Semiconductors User s Manual Preliminary P89LPC906 907 908 ANALOG COMPARATORS 2003 Dec 8 76 ...
Страница 86: ...Philips Semiconductors User s Manual Preliminary P89LPC906 907 908 WATCHDOG TIMER 2003 Dec 8 86 ...
Страница 104: ...Philips Semiconductors User s Manual Preliminary P89LPC906 907 908 REVISION HISTORY 2003 Dec 8 104 ...