Start Condition; Operation - Fujitsu MB86R02 Jade-D Hardware Manual

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MB86R02 'Jade-D' Hardware Manual V1.64

C bus communicates with two interactive bus lines; the serial data line (SDA) and the serial clock

This module is connected to the SDA and SCL lines through open drain IO cells.

29.8.1 Start condition

When a "1" is written to the MSS bit during 'bus open' (BB = 0), this module enters master mode and a

start condition occurs simultaneously. In master mode, the start condition can be incurred again by

writing a "1" to the SCC bit, even if the bus is in use (BB = 1).

There are 2 ways to initiate a start condition.

1. Writing "1" to the MSS bit in status (MSS = 0 & BB = 0 & INT = 0 & AL = 0) so that the bus is

2. Writing "1" to the SCC bit in interrupt status (MSS = 1 & BB = 1 & INT = 1 & AL = 0) on bus

If a "1" is written to the MSS bit during idle, the AL bit is set to "1". Writing a "1" to the MSS bit and the

SCC bit in states other than the above is ignored.

Start condition on the I

Changing the SDA line from "1" to "0" while the SCL line is "1" is called the 'start condition'.

Start condition