FEDL7029-03
OKI Semiconductor
ML7029
DEN, EXCK, DIN, DOUT
Serial control ports for MCU interface.
Reading and writing data are performed by an external MCU through these pins. The 8-byte cotrol registers
(CR0 to 7) are provided on the device.
DEN is the “Enable” control signal input, EXCK is the data shift clock input, DIN is the address and data input,
and DOUT is the data output.
Figures 2-1 and 2-2 show the input/output timing diagram. During power-down, the DOUT output is in a high
impedance state.
DEN
EXCK
DIN
DOUT
W
A2
A1
B7 B6 B5
A0
High Impedance
B4
B3
B2
B1
B0
(a) Data Write Timing Diagram
DEN
EXCK
DIN
DOUT
R
A2
High Impedance
A1
A0
B7 B6
B5
B4
B3
B2
B1
B0
(b) Data Read Timing Diagram
Figure 2-1 MCU Interface Input/Output Timing (DIN = 12 bits)
DEN
EXCK
DIN
DOUT
(a) Data Write Timing Diagram
W
A2
A1
A0
B7 B6
B5
B4
B3
B2
B1
B0
High Impedance
DEN
EXCK
DIN
DOUT
R
A2
A1
A0
B7 B6
B5
B4
B3
B2
B1
B0
High Impedance
(b) Data Read Timing Diagram
Figure 2-2 MCU Interface Input/Output Timing (DIN = 16 bits)
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