HT98R068-1 Two-way Radio OTP MCU
SPI Application Example Program
The source codes are attached in the HT98R068-1_AppInc.inc file where the SPI
application section contains:
SPI command Macro = SPITX (macro)
SPI Write = Procedure_SPI_Tx (procedure)
SPI Read = Procedure_SPI_Rx (procedure)
I/O Command (C[3-0]
：
Write/Read=8xxxx/9xxxx)
The [19-16] bits are setting differs for reading and writing. Set to “8(Dec)” for a write
command and “9(Dec)” for a read command. The audio processor will not reply with any
information during data writing. D7-D0 will be in a “Don’t Care” condition during a read
command execution. A7~A0 are the register addresses. D7~D0 are the access datas.
Write I/O CMD:
Master write:
SPI[19:16]
SPI[15:8]
SPI[7:0]
4’b1000 Address(A7~A0)
Data(D7~D0)
Audio processor reply:
SPI[19:16]
SPI[15:8]
SPI[7:0]
x (No signal)
x (No signal)
x (No signal)
Read I/O CMD:
Master Write:
SPI[19:16]
SPI[15:8]
SPI[7:0]
4’b
1001
Address(A7~A0)
x (Don’t care)
Audio processor reply:
SPI[19:16]
SPI[15:8]
SPI[7:0]
4’b1001 Address(A7~A0)
Data(D7~D0)
Ex: Write C3h to the I/O register
“1Eh” and then read this register to confirm if it is
correctly written.
Write 1Eh Flow
Flow description:
<81E3C>: Enable the DAC2, DAC1, AMP2, AMP1, Buffer, MIC and PGA circuits.
There will be no data response after the command is transmitted.
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