89LPC925 datasheet(23/49 Pages) PHILIPS

부품명	89LPC925

상세설명	8-bit microcontrollers with accelerated two-clock 80C51 core 4 kB/8 kB 3 V low-power Flash with 8-bit A/D converter

PDF	49 Pages

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제조업체	PHILIPS [NXP Semiconductors]

홈페이지	http://www.nxp.com

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23 / 49 page

Philips Semiconductors

P89LPC924/925

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

Product data

Rev. 03 — 15 December 2004

23 of 49

9397 750 14471

8.13 I/O ports

The P89LPC924/925 has three I/O ports: Port 0, Port 1, and Port 3. Ports 0 and 1 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 6.

[1]

Required for operation above 12 MHz.

Fig 6.

Interrupt sources, interrupt enables, and power-down wake-up sources.

002aaa792

IE0

EX0

IE1

EX1

BOF

EBO

KBIF

EKBI

INTERRUPT

TO CPU

WAKE-UP

(IF IN POWER-DOWN)

EWDRT

CMF2

CMF1

EA (IE0.7)

TF1

ET1

TI & RI/RI

ES/ESR

EST

EI2C

RTCF

ERTC

(RTCCON.1)

WDOVF

TF0

ET0

ENADCI1

ADCI1

ENBI1

BNDI1

EAD

Table 6:

Number of I/O pins available

Clock source

Reset option

Number of I/O pins

(20-pin package)

On-chip oscillator or

watchdog oscillator

No external reset (except during power-up) 18

External RST pin supported[1]

External clock input

No external reset (except during power-up) 17

External RST pin supported[1]

Low/medium/high speed

oscillator (external

crystal or resonator)

No external reset (except during power-up) 16

External RST pin supported[1]

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