HD64F3437TFI16V Renesas Electronics America, HD64F3437TFI16V Datasheet - Page 306

• Manufacturer Part Number: HD64F3437TFI16V
• Description: MCU FLASH 60K 100-TQFP
• Manufacturer: Renesas Electronics America

Specifications of HD64F3437TFI16V

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Transmitting and Receiving Data
SCI Initialization: The SCI must be initialized in the same way as in asynchronous mode. See
figure 12.4. When switching from asynchronous mode to synchronous mode, check that the
ORER, FER, and PER bits are cleared to 0. Transmitting and receiving cannot begin if ORER,
FER, or PER is set to 1.
Transmitting Serial Data: Follow the procedure in figure 12.13 for transmitting serial data.
274
1
2
3
TDR and clear TDRE bit to
Clear TE bit to 0 in SCR
Read TDRE bit in SSR
Read TEND bit in SSR
Write transmit data in
Serial transmission
Start transmitting
transmission?
TDRE = 1?
TEND = 1?
0 in SSR
Initialize
End of
End
Figure 12.13 Sample Flowchart for Serial Transmitting
Yes
Yes
Yes
No
No
No
1.
2.
3.
(a)
(b)
SCI initialization: the transmit data output function
of the TxD pin is selected automatically.
SCI status check and transmit data write: read
the serial status register (SSR), check that the
TDRE bit is 1, then write transmit data in the
transmit data register (TDR) and clear TDRE to 0.
Transition of the TDRE bit from 0 to 1 can be
reported by a TXI interrupt.
To continue transmitting serial data: read the
TDRE bit to check whether it is safe to write; if
TDRE = 1, write data in TDR, then clear TDRE
to 0.
To end serial transmission: end of transmission
can be confirmed by checking transition of the
TEND bit from 0 to 1. This can be reported by
a TEI interrupt.