HD6417641 RENESAS [Renesas Technology Corp], HD6417641 Datasheet - Page 783

• Manufacturer Part Number: HD6417641
• Manufacturer: RENESAS [Renesas Technology Corp]

5. When modem control is enabled, the RTS signal is output depending on the empty status of
Figure 19.10 shows an example of the operation when modem control is used.
19.4.3
In synchronous mode, the SCIF transmits and receives data in synchronization with clock pulses.
This mode is suitable for high-speed serial communication.
The SCIF transmitter and receiver are independent, so full-duplex communication is possible
while sharing the same clock. The transmitter and receiver are also 16-byte FIFO buffered, so
continuous transmitting or receiving is possible by reading or writing data while transmitting or
receiving is in progress.
SCFRDR. When RTS is 0, reception is possible. When RTS is 1, this indicates that SCFRDR
exceeds the number set for the RTS output active trigger.
Figure 19.9 Example of SCIF Receive Operation (8-Bit Data, Parity, One Stop Bit)
Serial
data
RDF
FER
Serial data
Synchronous Operation
RxD
RTS
Figure 19.10 Example of Operation Using Modem Control (RTS)
1
Start
bit
0
Start
bit
0
D0
D0
D1 D2
One frame
D1
Data
D7 0/1
D7
RXI interrupt
request
Parity
bit
Parity
bit
0/1
Section 19 Serial Communication Interface with FIFO (SCIF)
Stop
bit
1
Stop
bit
1
Start
bit
0
Data read and RDF flag
read as 1 then cleared to
0 by RXI interrupt handler
D0
D1
Rev. 4.00 Sep. 14, 2005 Page 733 of 982
Start
bit
Data
0
D0
D7
Parity
bit
D1
0/1
Stop
bit
ERI interrupt request
generated by receive
error
0
D7 0/1
REJ09B0023-0400
0/1