P89LPC920_921_922_9221 NXP Semiconductors, P89LPC920_921_922_9221 Datasheet - Page 6

• Manufacturer Part Number: P89LPC920_921_922_9221
• Description: The P89LPC920/921/922/9221 are single-chip microcontrollers designed forapplications demanding high-integration, low cost solutions over a wide range ofperformance requirements
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Table 3:
9397 750 14469
Product data
Symbol
P0.0 to P0.7
Pin description
Pin
1
20
19
18
17
16
14
13
5.2 Pin description
Type
I/O
I/O
O
I
I/O
I
I
I/O
I
I
I/O
I
I
I/O
I
I
I/O
I
I
I/O
O
I
I/O
I/O
I
Description
Port 0: Port 0 is an 8-bit I/O port with a user-configurable output type. During reset
Port 0 latches are configured in the input only mode with the internal pull-up disabled.
The operation of Port 0 pins as inputs and outputs depends upon the port configuration
selected. Each port pin is configured independently. Refer to
configurations”
The Keypad Interrupt feature operates with Port 0 pins.
All pins have Schmitt triggered inputs.
Port 0 also provides various special functions as described below:
P0.0 — Port 0 bit 0.
CMP2 — Comparator 2 output.
KBI0 — Keyboard input 0.
P0.1 — Port 0 bit 1.
CIN2B — Comparator 2 positive input B.
KBI1 — Keyboard input 1.
P0.2 — Port 0 bit 2.
CIN2A — Comparator 2 positive input A.
KBI2 — Keyboard input 2.
P0.3 — Port 0 bit 3. High current source (P89LPC9221).
CIN1B — Comparator 1 positive input B.
KBI3 — Keyboard input 3.
P0.4 — Port 0 bit 4. High current source (P89LPC9221).
CIN1A — Comparator 1 positive input A.
KBI4 — Keyboard input 4.
P0.5 — Port 0 bit 5. High current source (P89LPC9221).
CMPREF — Comparator reference (negative) input.
KBI5 — Keyboard input 5.
P0.6 — Port 0 bit 6. High current source (P89LPC9221).
CMP1 — Comparator 1 output.
KBI6 — Keyboard input 6.
P0.7 — Port 0 bit 7. High current source (P89LPC9221).
T1 — Timer/counter 1 external count input or overflow output.
KBI7 — Keyboard input 7.
Rev. 08 — 15 December 2004
and
Table 8 “DC electrical characteristics”
P89LPC920/921/922/9221
8-bit microcontrollers with two-clock 80C51 core
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
for details.
Section 8.12.1 “Port
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