BU92747XXX Datasheet, PDF (24/46 Pages) Rohm – IrDA Controller LSI built-in Ir remote control

BD92747XXX
Datasheet
●Ir Remote Control Functional Description
The MCR register (MCR10:RC_EN) set to "1" when Ir remote control function is used.
Serial 2- lines Interface
BU92747XXX is controlled by serial 2-lines slave interface. The address (slave address) is “1110111”.
A7
A6
A5
A4
A3
A2
A1
W/R
1
1
1
0
1
1
1
0/1
slave address
TRANSFER
During “H” period of SCL, one data bit is transferred. The data on the SDA line must be stable during the HIGH period
of the clock, as changes in the data line at this time will be interpreted as a control signal.
SDA
SCL
data line stable; ^{change of}
data valid
data allowed
START AND STOP CONDITIONS
Both data and clock lines 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 the START (S) condition. A LOW to HIGH transition of the data line while the clock is
HIGH is defined as the STOP (P) condition.
SDA
SCL
S
START condition
P
STOP condition
ACKNOWLEDGE
After the occurrence of START condition, each 8-bits has to be followed. A receiver must generate an
acknowledgement by pulling down the SDA line after the reception of each byte. In this event the transmitter leaves
the SDA line.
SDA output by
transmitter
SDA output by
receiver
SCL
S
1
START condition
Not acknowledge
Acknowledge
2
8
9
Clock pulse for
acknowledgement
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TSZ02201-0E4E0F100020-1-2
24. June. 2015 Rev.001