FEDL2500BFULL-02
OKI Semiconductor
ML2500BTA
FUNCTIONAL DESCRIPTION
Serial Peripheral Interface (SPI)
ML2500B communicates with the external Micro-Controller Unit through the industry's standard Serial Peripheral
Interface (SPI).
1. Timing for Writing Command Data
The following charts show timings for writing command data. After “L” input to CS pin, input command data,
starting with the MSB in serial order, to the DI pin in sync with the SCK signal.
The command input to the DI pin is fetched to the LSI’s internal shift resister at the rising edge of the SCK signal,
and then the command is executed at the rising edge of the CS pin. The DI input is either of 4, 8, or 24th bit.
When the CS pin is brought to “H” level except at 4/8/24th bit for the command, the command input then is
disregarded. It is a recommendable practice to input command data at the falling edge of the CS pin while having
the SCK pin at “L”.
4-bit Command Format
CS(I)
SCK(I)
DI(I)
C3 C2 C1 C0
C3 C2 C1 C0
8-bit Command Format
CS(I)
SCK(I)
DI(I)
C3 C2 C1 C0 D3 D2
D1 D0
C3 C2 C1
24-bit Command Format
CS(I)
1
2
3
4
5
6
7
8
9
10
X
11
X
12
SCK(I)
DI(I)
C3 C2 C1 C0
X
X
X
X
X
A12
CS(I)
SCK(I)
DI(I)
13
14
15 16 17
18
19
20 21
22 23
24
A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
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