P89LPC914FDH 查看數據表（PDF） - Philips Electronics

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P89LPC914FDH

8-bit microcontrollers with two-clock 80C51 core 1 kB 3 V Flash with 128-byte RAM

Philips Electronics 

Philips Semiconductors

P89LPC912/913/914

8-bit microcontrollers with two-clock 80C51 core

Table 4: P89LPC913 pin description…continued

Symbol

Pin

Type Description

P2.2, P2.3,

P2.5

I/O

Port 2: Port 2 is a 3-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 Section

9.11.1 “Port configurations” and Table 13 “DC electrical characteristics” for details.

All pins have Schmitt triggered inputs.

Port 2 also provides various special functions as described below:

13

I/O

P2.2 — Port 2 bit 2.

I/O

MOSI — SPI master out slave in. When configured as master, this pin is output,

when configured as slave, this pin is input.

14

I/O

P2.3 — Port 2 bit 3.

I/O

MISO — SPI master in slave out. When configured as master, this pin is input, when

configured as slave, this pin is output.

16

I/O

P2.5 — Port 2 bit 5.

I/O

SPICLK — SPI clock. When configured as master, this pin is output, when

configured as slave, this pin is input.

P3.0 to P3.1

I/O

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 Section

9.11.1 “Port configurations” and Table 13 “DC electrical characteristics” for details.

All pins have Schmitt triggered inputs.

Port 3 also provides various special functions as described below:

8

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.

7

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

4

I

Ground: 0 V reference.

VDD

10

I

Power Supply: This is the power supply voltage for normal operation as well as Idle

and Power-down modes.

9397 750 14468

Product data

Rev. 03 — 17 December 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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