Datasheet

78K0/Ix2 CHAPTER 14 SERIAL INTERFACE UART6/DALI
R01UH0010EJ0500 Rev.5.00 460
Feb 28, 2012
14.4.3 DALI mode
This mode is used to perform slave transmission/reception of DALI (Digital Addressable Lighting Interface).
DALI performs communication using the following protocol.
(1) Data structure
<1> Bit definition
A falling edge is bit-defined as “0” and a rising edge as “1”, because DALI communication uses Manchester code.
If no communication is performed, DALI communication is fixed to the high level.
Figure 14-26. Bit Definition
11001
<2> Frame
 Forward frame
This is a frame used when transmitting from the master to a slave. A frame consists of 19 bits.
Figure 14-27. Forward-Frame Structure
a
1-bit 1-bit 6-bit
b c d e f
1-bit
8-bit
8-bit 2-bit
a: Start bit
This indicates the start of the frame. It is always the same waveform as “1”.
b-d: Address byte
This specifies the transmission destination of the frame.
e: Data byte
This specifies a command.
f: Stop bit
This indicates the end of the frame. It is fixed to the high level.