P89LPC920_921_922_9221 NXP Semiconductors, P89LPC920_921_922_9221 Datasheet - Page 4

• 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
4. Block diagram
9397 750 14469
Product data
Fig 1. Block diagram.
RESONATOR
CRYSTAL
OR
P89LPC920/921/922/9221
OSCILLATOR DIVIDER
CONFIGURABLE I/Os
CONFIGURABLE I/Os
CONFIGURABLE I/Os
PROGRAMMABLE
CONFIGURABLE
2 kB/4 kB/8 kB
CODE FLASH
OSCILLATOR
INTERRUPT
DATA RAM
256-BYTE
KEYPAD
PORT 3
PORT 1
PORT 0
Rev. 08 — 15 December 2004
CPU
clock
ACCELERATED 2-CLOCK 80C51 CPU
internal bus
OSCILLATOR
ON-CHIP
RC
HIGH PERFORMANCE
P89LPC920/921/922/9221
8-bit microcontrollers with two-clock 80C51 core
(POWER-ON RESET,
BROWNOUT RESET)
POWER MONITOR
REAL-TIME CLOCK/
WATCHDOG TIMER
AND OSCILLATOR
SYSTEM TIMER
COMPARATORS
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
ANALOG
TIMER 0
TIMER 1
UART
I
2
C
002aaa410
4 of 46