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89LPC925 bảng dữ liệu(PDF) 23 Page - NXP Semiconductors

tên linh kiện 89LPC925
Giải thích chi tiết về linh kiện  8-bit microcontrollers with accelerated two-clock 80C51 core 4 kB/8 kB 3 V low-power Flash with 8-bit A/D converter
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nhà sản xuất  PHILIPS [NXP Semiconductors]
Trang chủ  http://www.nxp.com
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89LPC925 bảng dữ liệu(HTML) 23 Page - NXP Semiconductors

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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
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
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
EC
EA (IE0.7)
TF1
ET1
TI & RI/RI
ES/ESR
TI
EST
SI
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]
17
External clock input
No external reset (except during power-up) 17
External RST pin supported[1]
16
Low/medium/high speed
oscillator (external
crystal or resonator)
No external reset (except during power-up) 16
External RST pin supported[1]
15



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