H8SSLASH2224 datasheet(713/1071 Pages) RENESAS

713 / 1071 page

Section 15 Serial Communication Interface (SCI)

Rev. 5.00 Aug 08, 2006 page 627 of 982

REJ09B0054-0500

TDRE clearance. To transmit with a different transmit mode after clearing the relevant mode,

the procedure must be started again from initialization. Figure 15.39 shows a sample flowchart

for mode transition during transmission. Port pin states are shown in figures 15.40 and 15.41.

Operation should also be stopped (by clearing TE, TIE, and TEIE to 0) before making a

transition from transmission by DTC transfer to module stop mode, software standby mode,

watch mode, subactive mode, or subsleep mode transition. To perform transmission with the

DTC after the relevant mode is cleared, setting TE and TIE to 1 will set the TXI flag and start

DTC transmission.

Read TEND flag in SSR

TE = 0

Transition to software

standby mode, etc.

Exit from software

standby mode, etc.

Change

operating mode?

All data

transmitted?

TEND = 1

Yes

[1]

[3]

[2]

TE = 1

Initialization

[1]

Data being transmitted is interrupted.

After exiting software standby mode,

etc., normal CPU transmission is

possible by setting TE to 1, reading

SSR, writing TDR, and clearing

TDRE to 0, but note that if the DTC

has been activated, the remaining

data in DTCRAM will be transmitted

when TE and TIE are set to 1.

[2]

If TIE and TEIE are set to 1, clear

them to 0 in the same way.

[3]

Includes module stop mode, watch

mode, subactive mode, and subsleep

mode.

Figure 15.39 Sample Flowchart for Mode Transition during Transmission

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