p89lpc9221fn NXP Semiconductors, p89lpc9221fn Datasheet - Page 27

• Manufacturer Part Number: p89lpc9221fn
• Description: 8-bit Microcontrollers With Two-clock 80c51 Core 2 Kb/4 Kb/8 Kb 3 V Low-power Flash With 256-byte Data Ram
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 14469
Product data
8.19 I
I
connected to the bus, and it has the following features:
A typical I
device provides a byte-oriented I
400 kHz.
2
2
•
•
•
•
•
•
Fig 8. I
C-bus uses two wires (SDA and SCL) to transfer information between devices
C-bus serial interface
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 I
2
C-bus may be used for test and diagnostic purposes.
2
2
C-bus configuration.
C-bus configuration is shown in
I
2
C-BUS
Rev. 08 — 15 December 2004
P1.3/SDA
P89LPC920/921/922
P1.2/SCL
P89LPC920/921/922/9221
2
8-bit microcontrollers with two-clock 80C51 core
C-bus interface that supports data transfers up to
OTHER DEVICE
WITH I
R P
INTERFACE
Figure
2
C-BUS
R P
8. The P89LPC920/921/922/9221
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
OTHER DEVICE
WITH I
INTERFACE
2
C-BUS
002aaa420
SDA
SCL
27 of 46