p89lpc9401 NXP Semiconductors, p89lpc9401 Datasheet - Page 9

• Manufacturer Part Number: p89lpc9401
• Description: 8-bit Microcontroller With Accelerated Two-clock 80c51 Core 8 Kb 3 V Byte-erasable Flash With 32 Segment X 4 Lcd Driver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 3:
P89LPC9401_1
Preliminary data sheet
Symbol
P1.5/RST
P1.6
P1.7
P2.0 to P2.3,
P2.5
P2.0
P2.1
P2.2/MOSI
P2.3/MISO
P2.5/SPICLK
P3.0 to P3.1
P3.0/XTAL2/
CLKOUT
Pin description
Pin
11
10
9
6
7
18
19
20
14
…continued
Type Description
I
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
O
P1.5 — Port 1 bit 5 (input only).
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 ISP mode.
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
removed V
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
below the minimum specified operating range.
P1.6 — Port 1 bit 6.
P1.7 — Port 1 bit 7.
Port 2: Port 2 is an 5-bit I/O port with a user-configurable output type. During reset
Port 2 latches are configured in the input only mode with the internal pull-up disabled.
The operation of Port 2 pins as inputs and outputs depends upon the port configuration
selected. Each port pin is configured independently. Refer to
configurations”
All pins have Schmitt trigger inputs.
Port 2 also provides various special functions as described below:
P2.0 — Port 2 bit 0.
P2.1 — Port 2 bit 1.
P2.2 — Port 2 bit 2.
MOSI — SPI master out slave in. When configured as master, this pin is output; when
configured as slave, this pin is input.
P2.3 — Port 2 bit 3.
MISO — When configured as master, this pin is input, when configured as slave, this
pin is output.
P2.5 — Port 2 bit 5.
SPICLK — SPI clock. When configured as master, this pin is output; when configured
as slave, this pin is input.
Port 3: Port 3 is a 2-bit I/O port with a user-configurable output type. During reset
Port 3 latches are configured in the input only mode with the internal pull-up 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
configurations”
All pins have Schmitt triggered inputs.
Port 3 also provides various special functions as described below:
P3.0 — Port 3 bit 0.
XTAL2 — Output from the oscillator amplifier (when a crystal oscillator option is
selected via the flash configuration.
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 RTC/system timer.
8-bit two-clock 80C51 microcontroller with 32 segment
DD
Rev. 01 — 5 September 2005
will fall below the minimum specified operating voltage. When
and
and
DD
Table 11 “Static electrical characteristics”
Table 11 “Static electrical characteristics”
has reached its specified level. When system power is
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
P89LPC9401
Section 7.13.1 “Port
Section 7.13.1 “Port
for details.
for details.
4 LCD driver
DD
9 of 59
falls