HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 416

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 13 Serial Communication Interface (SCI)
Communication Formats: Four formats are available. Parity-bit settings are ignored when a
multiprocessor format is selected. For details see table 13.8.
Clock: See the description in the asynchronous mode section.
Transmitting Multiprocessor Serial Data: Figure 13.10 shows a sample flowchart for
transmitting multiprocessor serial data. The procedure for transmitting multiprocessor serial data is
listed below.
1. SCI initialization: select the TxD pin function with the PFC.
2. SCI status check and transmit data write: read the serial status register (SSR), check that the
3. To continue transmitting serial data: read the TDRE bit to check whether it is safe to write (1);
4. To output a break signal at the end of serial transmission: set the DR bit to 0 (I/O data port
Rev. 7.00 Jan 31, 2006 page 390 of 658
REJ09B0272-0700
Figure 13.9 Example of Communication between Processors Using Multiprocessor Format
TDRE bit is 1, then write transmit data in the transmit data register (TDR). Also set MPBT
(multiprocessor bit transfer) to 0 or 1 in SSR. Finally, clear TDRE to 0.
if so, write data in TDR, then clear TDRE to 0. When the DMAC is started by a transmit-data-
empty interrupt request (TXI) to write data in TDR, the TDRE bit is checked and cleared
automatically.
register), then clear TE to 0 in SCR and set the TxD pin function as output port with the PFC.
Serial
MPB: multiprocessor bit
data
Transmitting
processor A
processor
Receiving
(ID = 01)
receiving processor address
(Sending Data H'AA to Receiving Processor A)
ID-sending cycle:
H'01
processor B
Receiving
(MPB = 1)
(ID = 02)
Serial communication line
processor specified by ID
data sent to receiving
Data-sending cycle:
processor C
Receiving
(ID = 03)
H'AA
(MPB = 0)
processor D
Receiving
(ID = 04)