H8SSLASH2218 datasheet(471/750 Pages) RENESAS

部件名	H8S/2218

功能描述	16-Bit Single-Chip Microcomputer H8S Family/H8S/2200 Series

PDF	750 Pages

Scroll/Zoom	100%

制造商	RENESAS [Renesas Technology Corp]

网页	http://www.renesas.com

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471 / 750 page

Section 12 Serial Communication Interface

Rev.6.00 Jun. 03, 2008 Page 423 of 698

REJ09B0074-0600

<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]

Clear TE bit in SCR to 0

TDRE = 1

All data transmitted?

TEND = 1

[1]

SCI initialization:

The TxD pin is automatically designated as

the transmit data output pin.

[2]

SCI status 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, be sure to

read 1 from the TDRE flag to confirm that

writing is possible, then write data to TDR,

and then clear the TDRE flag to 0.

Checking and clearing of the TDRE flag is

automatic when the DMAC is activated by a

transmit data empty interrupt (TXI) request

and data is written to TDR.

Figure 12.20 Sample Serial Data Transmission Flowchart

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