SAA7712H Datasheet, PDF (22/44 Pages) NXP Semiconductors – Sound effects DSP

Philips Semiconductors
Sound effects DSP
Preliminary specification
SAA7712H
8.6.4 START AND STOP CONDITIONS
Both data and clock lines will remain HIGH when the bus is not busy. A HIGH-to-LOW transition of the data line, while
the clock is HIGH, is defined as a START condition (S). A LOW-to-HIGH transition of the data line while the clock is HIGH
is defined as a STOP condition (P) (see Fig.12).
handbook, full pagewidth
SDA
SCL
S
START condition
P
STOP condition
MGS217
Fig.12 START and STOP conditions.
8.6.5 DATA TRANSFER
A device generating a message is a ‘transmitter’ and a device receiving a message is the ‘receiver’. The device that
controls the message is the ‘master’ and the devices which are controlled by the master are the ‘slaves’.
handbook, full pagewidth
SDA
MSB
SCL
1
2
S
START condition
acknowledgement
signal from receiver
byte complete
interrupt within receiver
clock line held LOW while
interrupts are serviced
acknowledgement
signal from receiver
7
8
9
ACK
1
2
3 to 8
9
ACK
MGS218
Fig.13 Data transfer on the I²C-bus.
1999 Aug 05
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