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CHAPTER 17 SERIAL INTERFACE CHANNEL 1
Figure 17-8. Basic Transmit/Receive Mode Flowchart
Start
Write transmit data
in buffer RAM
Set ADTP to the value (pointer
value) obtained by subtracting 1
from the number of transmit data
bytes
Write any data to SIO1
(start trigger)
Write transmit data from buffer
RAM to SIO1
Transmission/reception
operation
Write receive data from SIO1
to buffer RAM
Pointer value = 0
Yes
TRF = 0
Yes
End
ADTP : Automatic data transmit/receive address pointer
SIO1 : Serial I/O shift register 1
TRF
: Bit 3 of automatic data transmit/receive control register (ADTC)
Decrement pointer value
No
No
Software Execution
Hardware Execution
Software Execution
427
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