Section 10 Serial Communication Interface
Rev. 6.00 Aug 04, 2006 page 391 of 680
REJ09B0145-0600
Start
End
Read bit TDRE
in SSR
Sets bits SPC31 and
SPC32 to 1 in SPCR
1
2
Write transmit
data to TDR
Read bit TEND
in SSR
Clear bit TE to 0
in SCR3
No
TDRE = 1?
Yes
Continue data
transmission?
No
TEND = 1?
Yes
Yes
No
Read the serial status register (SSR) and
check that bit TDRE is set to 1, then write
transmit data to the transmit data register
(TDR). When data is written to TDR, bit
TDRE is cleared to 0 automatically, the
clock is output, and data transmission is
started. When clock output is selected,
the clock is output and data transmission
started when data is written to TDR.
When continuing data transmission, be
sure to read TDRE = 1 to confirm that
a write can be performed before writing
data to TDR. When data is written to
TDR, bit TDRE is cleared to 0 automatically.
1.
2.
Figure 10.16 Example of Data Transmission Flowchart (Synchronous Mode)
Summary of Contents for H8/38342
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Page 240: ...Section 7 RAM Rev 6 00 Aug 04 2006 page 202 of 680 REJ09B0145 0600...
Page 468: ...Section 12 A D Converter Rev 6 00 Aug 04 2006 page 430 of 680 REJ09B0145 0600...
Page 580: ...Section 15 Electrical Characteristics Rev 6 00 Aug 04 2006 page 542 of 680 REJ09B0145 0600...