Renesas ZTAT H8S/2357F, Hardware Manual

Page: 535 / 1047

Rev.6.00 Oct.28.2004 page 507 of 1016
REJ09B0138-0600H
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Serial data transmission (clocked synchronous mode)
Figure 14-16 shows a sample flowchart for serial transmission.
The following procedure should be used for serial data transmission.
No
<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
No
Yes
No
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 or
DTC is activated by a transmit data
empty interrupt (TXI) request and data
is written to TDR.
Figure 14-16 Sample Serial Transmission Flowchart