Data Sheet

NUC123
May 3, 2017 Page 61 of 99 Rev.2.04
NUC123 SERIES DATASHEET
I
2
C Serial Interface Controller (Master/Slave) (I
2
C) 6.13
6.13.1 Overview
I
2
C is a two-wire, bi-directional serial bus that provides a simple and efficient method of data
exchange between devices. The I
2
C standard is a true multi-master bus including collision
detection and arbitration that prevents data corruption if two or more masters attempt to control
the bus simultaneously.
There are two sets of I
2
C controllers which support Power-down wake-up function.
6.13.2 Features
 Supports up to two I
2
C ports
 Master/Slave mode
 Bidirectional data transfer between masters and slaves
 Multi-master bus (no central master)
 Arbitration between simultaneously transmitting masters without corruption of serial data on
the bus
 Serial clock synchronization allow devices with different bit rates to communicate via one
serial bus
 Built-in 14-bit time-out counter requesting the I
2
C interrupt if the I
2
C bus hangs up and timer-
out counter overflows.
 Programmable clocks allow for versatile rate control
 Supports 7-bit addressing mode
 Supports multiple address recognition ( four slave address with mask option)
 Supports Power-down wake-up function