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P89LPC9401 Datasheet(Scheda tecnica) 21 Page - NXP Semiconductors

Numero della parte P89LPC9401
Dettagli  8-bit microcontroller with accelerated two-clock 80C51 core 8 kB 3 V byte-erasable flash with 32 segment x 4 LCD driver
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Produttore  PHILIPS [NXP Semiconductors]
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P89LPC9401 Datasheet(HTML) 21 Page - NXP Semiconductors

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P89LPC9401_1
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Preliminary data sheet
Rev. 01 — 5 September 2005
21 of 59
Philips Semiconductors
P89LPC9401
8-bit two-clock 80C51 microcontroller with 32 segment
× 4 LCD driver
7.13 I/O ports
The P89LPC9401 has four I/O ports: Port 0 and Port 1 are 8-bit ports. Port 2 is a 5-bit
port. Port 3 is a 2-bit port. The exact number of I/O pins available depends upon the clock
and reset options chosen, as shown in Table 6.
[1]
Required for operation above 12 MHz.
7.13.1 Port configurations
All but three I/O port pins on the P89LPC9401 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.
Fig 7.
Interrupt sources, interrupt enables, and power-down wake-up sources
002aab464
IE0
EX0
IE1
EX1
BOF
EBO
KBIF
EKBI
interrupt
to CPU
wake-up
(if in power-down)
EWDRT
CMF2
CMF1
EC
EA (IE0.7)
TF1
ET1
TI and RI/RI
ES/ESR
TI
EST
SI
EI2C
SPIF
ESPI
RTCF
ERTC
(RTCCON.1)
WDOVF
TF0
ET0
Table 6:
Number of I/O pins available
Clock source
Reset option
Number of I/O pins
(not including LCD
pins)
On-chip oscillator or watchdog oscillator
No external reset (except during power-up)
23
External RST pin supported
22
External clock input
No external reset (except during power-up)
22
External RST pin supported [1]
21
Low/medium/high speed oscillator
(external crystal or resonator)
No external reset (except during power-up)
21
External RST pin supported [1]
20


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