參數(shù)資料
型號: P89LPC931
英文描述: 8-bit microcontrollers with two-clock 80C51 core 4 kB/8 kB 3 V Flash with 256-byte data RAM
中文描述: 8位微控制器兩個小時80C51的核心4 KB的/ 8 KB的256 3伏閃存內(nèi)存字節(jié)的數(shù)據(jù)
文件頁數(shù): 20/54頁
文件大小: 1015K
代理商: P89LPC931
Philips Semiconductors
P89LPC930/931
8-bit microcontrollers with two-clock 80C51 core
Product data
Rev. 03 — 06 October 2003
20 of 54
9397 750 12122
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
8.11 I/O ports
The P89LPC930/931 has four I/O ports: Port 0, Port 1, Port 2, and Port 3. Ports 0, 1
and 2 are 8-bit ports, and Port 3 is a 2-bit port. The exact number of I/O pins available
depend upon the clock and reset options chosen, as shown in
Table 5
.
8.11.1
Port configurations
All but three I/O port pins on the P89LPC930/931 may be configured by software to
one of four types on a bit-by-bit basis. These are: quasi-bidirectional (standard 80C51
port outputs), push-pull, open drain, and input-only. Two configuration registers for
each port select the output type for each port pin.
P1.5 (RST) can only be an input and cannot be configured.
Fig 5.
Interrupt sources, interrupt enables, and power-down wake-up sources.
002aaa432
IE0
EX0
IE1
EX1
BOPD
EBO
KBIF
EKBI
INTERRUPT
TO CPU
WAKE-UP
(IF IN POWER-DOWN)
EWDRT
CMF2
CMF1
EC
EA (IE0.7)
TF0
ET0
TF1
ET1
TI & RI/RI
ES/ESR
TI
EST
SI
EI2C
SPIF
ESPI
RTCF
ERTC
(RTCCON.1)
WDOVF
Table 5:
Clock source
Number of I/O pins available
Reset option
Number of I/O pins
(20-pin package)
26
25
25
24
24
23
On-chip oscillator or Watchdog oscillator
No external reset (except during power-up)
External RST pin supported
No external reset (except during power-up)
External RST pin supported
No external reset (except during power-up)
External RST pin supported
External clock input
Low/medium/high speed oscillator
(external crystal or resonator)
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