參數(shù)資料
型號(hào): P89LPC922
廠商: NXP Semiconductors N.V.
英文描述: MINIATURE POWER RELAY
中文描述: 8位微控制器兩個(gè)小時(shí)80C51的核心2鍵盤/ 4 KB的/ 8 KB的3伏的低功耗Flash 256 - RAM的字節(jié)數(shù)據(jù)
文件頁(yè)數(shù): 7/45頁(yè)
文件大?。?/td> 877K
代理商: P89LPC922
Philips Semiconductors
P89LPC920/921/922
8-bit microcontrollers with two-clock 80C51 core
Product data
Rev. 06 — 21 November 2003
7 of 45
9397 750 12285
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
P1.0 - P1.7
12, 11, 10,
9, 8, 4, 3,
2
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 8.12.1 “Port configurations”
and
Table 8 “DC electrical characteristics”
for details. P1.2 - P1.3 are open drain when
used as outputs. P1.5 is input only.
All pins have Schmitt triggered inputs.
Port 1 also provides various special functions as described below:
I/O
P1.0 —
Port 1 bit 0.
O
TXD —
Transmitter output for the serial port.
I/O
P1.1 —
Port 1 bit 1.
I
RXD —
Receiver input for the serial port.
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 —
I
2
C serial clock input/output.
I/O
P1.3 —
Port 1 bit 3 (open-drain when used as output).
I
INT0 —
External interrupt 0 input.
I/O
SDA —
I
2
C serial data input/output.
I/O
P1.4 —
Port 1 bit 4.
I
INT1 —
External interrupt 1 input.
I
P1.5 —
Port 1 bit 5 (input only).
I
RST —
External Reset input (if selected via FLASH configuration). 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.
I/O
P1.6 —
Port 1 bit 6.
I/O
P1.7 —
Port 1 bit 7.
12
11
10
9
8
4
3
2
Table 3:
Symbol
Pin description
…continued
Pin
Type
Description
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