P89LPC9321FN データシートの表示（PDF） - NXP Semiconductors.

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P89LPC9321FN

8-bit microcontroller with accelerated two-clock 80C51 core 8 kB 3 V byte-erasable flash with 512-byte data EEPROM

NXP Semiconductors. 

NXP Semiconductors

P89LPC9321

8-bit microcontroller with accelerated two-clock 80C51 core

Table 3. Pin description …continued

Symbol

Pin

Type Description

P0.6/CMP1/KBI6 20

I/O P0.6 — Port 0 bit 6. High current source.

O CMP1 — Comparator 1 output.

I

KBI6 — Keyboard input 6.

P0.7/T1/KBI7

19

I/O P0.7 — Port 0 bit 7. High current source.

I/O T1 — Timer/counter 1 external count input or overflow output.

I

KBI7 — Keyboard input 7.

P1.0 to P1.7

I/O, I

[1]

Port 1: Port 1 is an 8-bit I/O port with a user-configurable output type, except for

three pins as noted below. During reset Port 1 latches are configured in the input

only mode with the internal pull-up disabled. The operation of the configurable

Port 1 pins as inputs and outputs depends upon the port configuration selected.

Each of the configurable port pins are programmed independently. Refer to

Section 7.16.1 “Port configurations” and Table 10 “Static characteristics” for

details. P1.2 to P1.3 are open drain when used as outputs. P1.5 is input only.

All pins have Schmitt trigger inputs.

Port 1 also provides various special functions as described below:

P1.0/TXD

18

I/O P1.0 — Port 1 bit 0.

O TXD — Transmitter output for serial port.

P1.1/RXD

17

I/O P1.1 — Port 1 bit 1.

I

RXD — Receiver input for serial port.

P1.2/T0/SCL

12

I/O P1.2 — Port 1 bit 2 (open-drain when used as output).

I/O T0 — Timer/counter 0 external count input or overflow output (open-drain when

used as output).

I/O SCL — I2C-bus serial clock input/output.

P1.3/INT0/SDA

11

I/O P1.3 — Port 1 bit 3 (open-drain when used as output).

I

INT0 — External interrupt 0 input.

I/O SDA — I2C-bus serial data input/output.

P1.4/INT1

10

I/O P1.4 — Port 1 bit 4. High current source.

I

INT1 — External interrupt 1 input.

P1.5/RST

6

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 ISP mode.

P1.6/OCB

5

I/O P1.6 — Port 1 bit 6. High current source.

O OCB — Output Compare B

P1.7/OCC

4

I/O P1.7 — Port 1 bit 7. High current source.

O OCC — Output Compare C.

P2.0 to P2.7

I/O Port 2: Port 2 is an 8-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 7.16.1 “Port configurations” and Table 10 “Static characteristics” for

details.

All pins have Schmitt trigger inputs.

Port 2 also provides various special functions as described below:

P89LPC9321_1

Product data sheet

Rev. 01 — 9 December 2008

© NXP B.V. 2008. All rights reserved.

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