H8SSLASH2214 datasheet(19/936 Pages) RENESAS

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Rev.4.00 Sep. 18, 2008 Page xix of lx

REJ09B0189-0400

Item

Page

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12.3.3

Multiprocessor

Communication

Function

Figure 12.14

Sample

Multiprocessor

Serial Transmission

Flowchart

503

Note added

<End>

[1]

Yes

Initialization

Start transmission

Read TDRE flag in SSR

[2]

Write transmit data to TDR and

set MPBT bit in SSR

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?

Clear TDRE flag to 0

SCI initialization:

The TxD pin is automatically

designated as the transmit data

output pin.

After the TE bit is set to 1, a

frame of 1s is output, and

transmission is enabled.

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. Set the

MPBT bit in SSR to 0 or 1.

Finally, clear the TDRE flag to 0.

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 or DTC* is activated by a

transmit data empty interrupt

(TXI) request, and data is written

to TDR.

Break output at the end of serial

transmission:

To output a break in serial

transmission, set the port DDR to

1, clear DR to 0, then clear the

TE bit in SCR to 0.

[1]

[2]

[3]

[4]

Note: * The TDRE flag is cleared

automatically by DTC only

when the DTC DISEL bit is 0

and furthermore the transfer

counter is not 0. Therefore

the CPU must clear the

TDRE flag when either DISEL

is 1 or when DISEL is 0 and

furthermore the transfer

counter is 0.

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