HD64F36022 datasheet(232/384 Pages) RENESAS

232 / 384 page

Section 13 Serial Communication Interface 3 (SCI3)

Rev. 4.00 Sep. 23, 2005 Page 206 of 354

REJ09B0025-0400

Yes

<End>

Start transmission/reception

[3]

Error processing

[4]

Read receive data in RDR

Yes

OER = 1

All data received?

[1]

Read TDRE flag in SSR

Yes

TDRE = 1

Write transmit data to TDR

Yes

RDRF = 1

Read OER flag in SSR

[2]

Read RDRF flag in SSR

Clear TE and RE bits in SCR to 0

[1]

Read SSR and check that the TDRE

flag is set to 1, then write transmit

data to TDR.

When data is written to TDR, the

TDRE flag is automatically cleared to

[2]

Read SSR and check that the RDRF

flag is set to 1, then read the receive

data in RDR.

When data is read from RDR, the

RDRF flag is automatically cleared to

[3]

To continue serial transmission/

reception, before the MSB (bit 7) of

the current frame is received, finish

reading the RDRF flag, reading RDR.

Also, before the MSB (bit 7) of the

current frame is transmitted, read 1

from the TDRE flag to confirm that

writing is possible. Then write data to

TDR.

When data is written to TDR, the

TDRE flag is automatically cleared to

0. When data is read from RDR, the

RDRF flag is automatically cleared to

[4]

If an overrun error occurs, read the

OER flag in SSR, and after

performing the appropriate error

processing, clear the OER flag to 0.

Transmission/reception cannot be

resumed if the OER flag is set to 1.

For overrun error processing, see

figure 13.13.

Figure 13.14 Sample Flowchart of Simultaneous Serial Transmit and Receive Operations

(Clocked Synchronous Mode)

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