DF2211NP24V Renesas Technology / Hitachi Semiconductor, DF2211NP24V Datasheet - Page 477

• Manufacturer Part Number: DF2211NP24V
• Description: H8S/2200 Series, 2212 Group, USB, RTC, HSS TNP-64B; Vcc= 2.7 to 3.6 volts, Temp= -20 to 75 C; Package: PVQN0064LB-A
• Manufacturer: Renesas Technology / Hitachi Semiconductor

Write transmit data to TDR and
clear TDRE flag in SSR to 0
Read TDRE flag in SSR
Read TEND flag in SSR
Clear TE bit in SCR to 0
All data transmitted?
Start transmission
Figure 12.20 Sample Serial Data Transmission Flowchart
Initialization
TDRE = 1
TEND = 1
<End>
Yes
Yes
Yes
No
No
No
[3]
[2]
[1]
[1]
[2]
[3]
Rev.7.00 Dec. 24, 2008 Page 423 of 698
SCI initialization:
The TxD pin is automatically designated as
the transmit data output pin.
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.
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 is activated by a
transmit data empty interrupt (TXI) request
and data is written to TDR.
REJ09B0074-0700