89LPC925 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

89LPC925

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

Philips Electronics 

Philips Semiconductors

P89LPC924/925

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

8.20 I2C-bus serial interface

I2C-bus uses two wires (SDA and SCL) to transfer information between devices

connected to the bus, and it has the following features:

• Bidirectional data transfer between masters and slaves

• Multimaster bus (no central master)

• Arbitration between simultaneously transmitting masters without corruption of

serial data on the bus

• Serial clock synchronization allows devices with different bit rates to communicate

via one serial bus

• Serial clock synchronization can be used as a handshake mechanism to suspend

and resume serial transfer

• The I2C-bus may be used for test and diagnostic purposes.

A typical I2C-bus configuration is shown in Figure 8. The P89LPC924/925 device

provides a byte-oriented I2C-bus interface that supports data transfers up to 400 kHz.

I2C-BUS

RP

RP

P1.3/SDA P1.2/SCL

P89LPC920/921/922

OTHER DEVICE

WITH I2C-BUS

INTERFACE

Fig 8. I2C-bus configuration.

SDA

SCL

OTHER DEVICE

WITH I2C-BUS

INTERFACE

002aaa420

9397 750 13459

Product data

Rev. 02 — 15 June 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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