HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 427

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

Transmitting Serial Data (Synchronous Mode): Figure 13.17 shows a sample flowchart for
transmitting serial data. The procedure for transmitting 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.
TDRE bit is 1, then write transmit data in the transmit data register (TDR) and clear TDRE to
0.
To continue transmitting serial data: read the TDRE bit to check whether it is safe to write (1);
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.
Figure 13.17 Sample Flowchart for Serial Transmitting
Write transmit data in TDR and
clear TDRE bit to 0 in SSR
Read TDRE bit in SSR
Read TEND bit in SSR
Clear TE bit SCR to 0
All data transmitted?
Transmission ends
Start transmitting
TDRE = 1?
TEND = 1?
Initialize
Yes
Yes
Yes
Section 13 Serial Communication Interface (SCI)
Rev. 7.00 Jan 31, 2006 page 401 of 658
No
No
No
(1)
(2)
(3)
REJ09B0272-0700