Section 17 Serial Communication Interface with FIFO (SCIF)
Rev. 1.00 Apr. 28, 2008 Page 517 of 994
REJ09B0452-0100
(2) Serial Data Transmission
Figure 17.4 shows an example of the data transmission flowchart.
Start transmission
Read THRE flag in FLSR
Write transmit data to FTHR
Read TEMT flag in FLSR
THRE = 1?
All data written
Yes
No
No
No
Yes
Yes
TEMT = 1
No
Yes
Break output
(End of transmission or transmission standby)
Yes
Break time completed
Initialization
Set BREAK bit in FLCR to 1
Clear BREAK bit in FLCR to 0
[1]
[2]
[3]
[1] Confirm that the THRE flag in FLSR is 1, and write transmit
data to FTHR. When FIFOs are used, write 1-byte to 16-byte
transmit data. When the OUT2 bit in FMCR and the ETBEI bit
in FIER are set to 1, an FTHR empty interrupt occurs. When
data is written to FTHR, it is transferred automatically to FTSR.
The data is then transmitted from the FTxD pin in the order of
the start bit, transmit data, parity bit, and stop bit.
[2] Read the TEMT flag in FLSR, and confirm that TEMT is set to
1 to ensure that all transmit data has been transmitted.
[3] To output a break at the end of serial transmission, set the
BREAK bit in FLCR to 1. After completion of the break time,
clear the BREAK bit in FLCR to 0 to clear the break.
Figure 17.4 Example of Data Transmission Flowchart
Содержание H8S/2100 Series
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