PEDL9044-03
1
Semiconductor
ML9044-xxA/xxB
Serial Interface Mode
In the Serial I/F Mode, the ML9044 interfaces with the CPU via the CS, SHT, SI and SO pins.
Writing and reading operations are executed in units of 16 bits after the CS signal falls down. If the CS signal rises
up before the completion of 16-bit unit access, this access is ignored.
When the BF bit is “1”, the ML9044 cannot accept any other instructions. Before inputting a new instruction,
check that the BF bit is “0”. Any access when the BF bit is “1” is ignored.
Data format is LSB-first.
Examples of Access in the Serial I/F Mode
1) WRITE MODE
CS
1
1
2
1
3
1
4
1
5
1
6
7
8
9
10 11 12 13 14 15 16
SHT
SI
RS0 RS1 D0 D1 D2 D3 D4 D5 D6 D7
W
R/
SO
2) READ MODE
CS
1
1
2
1
3
1
4
1
5
1
6
7
8
9
10 11 12 13 14 15 16
SHT
SI
RS0 RS1
W
R/
D0 D1 D2 D3 D4 D5 D6 D7
SO
32/60
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