P89LPC9102_9103_9107_3 © NXP B.V. 2007. All rights reserved.
Product data sheet Rev. 03 — 10 July 2007 13 of 61
NXP Semiconductors
P89LPC9102/9103/9107
8-bit microcontrollers with two-clock accelerated 80C51 core
P1.5/RST 2 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. When using an oscillator frequency above 12 MHz, the
reset input function of P1.5 must be enabled. An external circuit is required to
hold the device in reset at power-up until V
DD
has reached its specified level.
When system power is removed V
DD
will fall below the minimum specified
operating voltage. When using an oscillator frequency above 12 MHz, in some
applications, an external brownout detect circuit may be required to hold the
device in reset when V
DD
falls below the minimum specified operating voltage.
V
SS
3I Ground: 0 V reference.
V
DD
7I Power supply: This is the power supply voltage for normal operation as well as Idle
mode and Power-down mode.
Table 5. P89LPC9103 pin description
…continued
Symbol Pin Type Description
Table 6. P89LPC9107 pin description
Symbol Pin Type Description
P0.1 to P0.5,
P0.7
I/O Port 0: Port 0 is an I/O port with a user-configurable output type. During reset Port 0
latches are configured in the input-only mode with the internal pull-up 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
Section 8.12.1 “Port
configurations” and Table 12 “Static characteristics” 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:
P0.1/KBI1/
AD10
5 I/O P0.1 — Port 0 bit 1.
I KBI1 — Keyboard input 1.
I AD10 — ADC1 channel 0 analog input.
P0.2/KBI2/
AD11
1 I/O P0.2 — Port 0 bit 2.
I KBI2 — Keyboard input 2.
I AD11 — ADC1 channel 1 analog input.
P0.3/CIN1B/
AD12
14 I/O P0.3 — Port 0 bit 3.
I CIN1B — Comparator 1 positive input.
I AD12 — ADC1 channel 2 analog input.
P0.4/CIN1A/
AD13/DAC1
12 I/O P0.4 — Port 0 bit 4.
I CIN1A — Comparator 1 positive input.
I AD13 — ADC1 channel 3 analog input.
O DAC1 — Digital to analog converter output.
P0.5/CMPREF/
CLKIN
11 I/O P0.5 — Port 0 bit 5.
I CMPREF — Comparator reference (negative) input.
I CLKIN — External clock input.
P0.7/T1/
CLKOUT
8 I/O P0.7 — Port 0 bit 7.
I/O T1 — Timer/counter 1 external count input or overflow/PWM output.
I CLKOUT — Clock output.
