Filter
Top Products
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
User manual Rev. 02 — 23 May 2005 27 of 133
Philips Semiconductors
UM10109
P89LPC932A1 User manual
4. I/O ports
The P89LPC932A1 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 depends
upon the clock and reset options chosen (see Tabl e 8
).
[1] Required for operation above 12 MHz.
(1) See Section 9 “
Capture/Compare Unit (CCU)”.
Fig 8. Interrupt sources, interrupt enables, and power-down wake-up sources.
002aaa892
IE0
EX0
IE1
EX1
BOPD
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
SPIF
ESPI
RTCF
ERTC
(RTCCON.1)
WDOVF
TF0
ET0
any CCU interrupt (1)
ECCU
EIEE
EEIF
Table 8: Number of I/O pins available
Clock source Reset option Number of I/O
pins
On-chip oscillator or watchdog
oscillator
No external reset (except during power up) 26
External RST
pin supported 25
External clock input No external reset (except during power up) 25
External RST
pin supported
[1]
24
Low/medium/high speed oscillator
(external crystal or resonator)
No external reset (except during power up) 24
External RST
pin supported
[1]
23