HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 397

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

Figure 13.13 Example of SCI Receive Operation (own ID matches data) (8-bit data with
13.3.4
In the clocked synchronous mode, the SCI transmits and receives data in synchronization with
clock pulses. This mode is suitable for high-speed serial communication.
The SCI transmitter and receiver share the same clock but are otherwise independent, so full
duplex communication is possible. The transmitter and receiver are also double buffered, so
continuous transmitting or receiving is possible by reading or writing data while transmitting or
receiving is in progress.
Figure 13.14 shows the general format in clocked synchronous serial communication.
HITACHI 384
RDRF
Serial
MPIE
value
interrupt) MPIE = 0
MPB
RDR
data
(multiprocessor
RXI request,
multiprocessor bit and one stop bit) (cont)
Clocked Synchronous Operation
1
Start
bit
0
D
0
D
Data ID1
1
handler reads data
in RDR and clears
D
RXI interrupt
RDRF to 0
7
MPB
1
Stop
bit
1
Start
bit
0
D
0
set to 1 again
Not own ID,
D
so MPIE is
1
Data 1
D
7
ID1
MPB
0
RDR maintains
Stop
bit
1
interrupt,
No RXI
state
Idle (mark
state)
1