lc78684e Sanyo Semiconductor Corporation, lc78684e Datasheet - Page 8

• Manufacturer Part Number: lc78684e
• Description: Mp3 Decoder For Compact Disc Players
• Manufacturer: Sanyo Semiconductor Corporation

Command Input/Data Output Interface
Input commands (i.e. write data to the LC78684E) in the order data first and then address. The data and address are LSB first.
Output data is output (i.e. read data from the LC78684E) by first issuing a read mode setup command and then performing
read access operations.
Data write
Data read
Data is read by first writing the register address to be read to location $61h and then setting up read mode by setting CE low
temporarily. When CE is set high again, and the CL signal is issued, the contents of the specified register are output from
CMDOUT, LSB first.
The microcontroller must perform a read access if it sets up read mode.
CE
CL
CMDIN
CMDOUT
CE
CL
CMDIN
CMDOUT
High (Held high with an external pull-up resistor)
LSB
LSB
Register address
Read mode setup command
High (Held high with an external pull-up resistor)
Data
MSB LSB
Read code (61h)
LC78684E
MSB
LSB
MSB
Address
LSB
Read access
MSB
MSB
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