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Rev. 5.00, 09/03, page 549 of 760
Figure 16.11 shows an example of the operation for reception.
RDF
FER
ERI interrupt
request generated
by receive error
One frame
Data read and RDF
flag read as 1 then
cleared to 0 by
RXI interrupt handler
RXI interrupt
request
01
1
1
0/1 0 1
Parity
bit
Parity
bit
Serial
data
Start
bit
Data
Stop
bit
Start
bit
Data
Stop
bit
Idle (mark)
state
D
0
D
1
D
7
D
0
D
1
D
7
0/1
Figure 16.11 Example of SCIF Receive Operation
(8-Bit Data, Parity, One Stop Bit)
5. When modem control is enabled, the RTS signal is output when SCFRDR is empty. When
RTS is 0, reception is possible. When RTS is 1, this indicates that SCFRDR is full and
reception is not possible.
Figure 16.12 shows an example of the operation when modem control is used.
0 0/1 01
RTS
Parity bit
Serial
data
RXD
Start
bit
Start
D
0
D
1
D
2
D
7
Figure 16.12 Example of Operation Using Modem Control (R
RR
RT
TT
TS
SS
S)