H8SX1663 datasheet(756/1158 Pages) RENESAS

756 / 1158 page

Section 15 Serial Communication Interface (SCI, IrDA, CRC)

Rev.1.00 Jun. 07, 2006 Page 704 of 1102

REJ09B0294-0100

<End>

[1]

Yes

Initialization

Start transmission

Read TDRE flag in SSR

[2]

Write transmit data to TDR

and clear TDRE flag in SSR to 0

Yes

Read TEND flag in SSR

[3]

Yes

[4]

Clear DR to 0 and

set DDR to 1

Clear TE bit in SCR to 0

TDRE = 1

All data transmitted?

TEND = 1

Break output

[1] SCI initialization:

The TxD pin is automatically

designated as the transmit data

output pin. After the TE bit is set to

1, a 1 is output for a frame, and

transmission is enabled.

[2] SCI state check and transmit data

write:

Read SSR and check that the

TDRE flag is set to 1, then write

transmit data to TDR and clear the

TDRE flag to 0.

[3] Serial transmission continuation

procedure:

To continue serial transmission,

read 1 from the TDRE flag to

confirm that writing is possible,

then write data to TDR, and clear

the TDRE flag to 0. However, the

TDRE flag is checked and cleared

automatically when the DMAC or

DTC is initiated by a transmit data

empty interrupt (TXI) request and

writes data to TDR.

[4] Break output at the end of serial

transmission:

To output a break in serial

transmission, set DDR for the port

corresponding to the TxD pin to 1,

clear DR to 0, then clear the TE bit

in SCR to 0.

Figure 15.10 Example of Serial Transmission Flowchart

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