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2
SERIAL COMMUNICATION MODULE REPLACEMENT
(a) When application instructions (FROM/TO) are used
Send
Module
Transmission
Send
enable
ready
complete
request
flag
signal
Transmission
complete
Send completion
check flag
Receive
data read
Receive completion
check flag
2
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Transmission processing
Write No. of send data.
Write send data.
Send
data
Perform send request.
Send
request
Turn off the send request
Send
signal upon transmission
request
completion.
(Flag control at transmission
Transmission normal
completion)
complete flag
Transmission normal
complete flag
Reception processing
Read No. of receive data.
No. of receive
data
Transfer the No. of receive
No. of receive
data to the index register.
data
Read received amount of data.
Receive
data
Turn on the read complete
Receive data
signal of the receive data.
read complete
(Flag control at reception
Reception normal
completion)
complete flag
Reception normal
complete flag
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