HD64F2145 datasheet(417/829 Pages) RENESAS

Part #	HD64F2145

Description	Hitachi 16-Bit Single-Chip Microcomputer

PDF	829 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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417 / 829 page

Rev. 2.0, 08/02, page 377 of 788

<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.

However, the TDRE flag is checked

and cleared automatically when the

DTC is initiated by a transmit data

empty interrupt (TXI) request and

writes data to TDR.

Figure 15.17 Sample Serial Transmission Flowchart

HD64F2145 Datasheet(PDF) 417 Page - Renesas Technology Corp