h8s-2161b Renesas Electronics Corporation., h8s-2161b Datasheet - Page 449

• Manufacturer Part Number: h8s-2161b
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

15.6.3
Figure 15.16 shows an example of SCI operation for transmission in clocked synchronous mode.
In serial transmission, the SCI operates as described below.
1. The SCI monitors the TDRE flag in SSR, and if it is 0, recognizes that data has been written to
2. After transferring data from TDR to TSR, the SCI sets the TDRE flag to 1 and starts
3. 8-bit data is sent from the TxD pin synchronized with the output clock when output clock
4. The SCI checks the TDRE flag at the timing for sending the last bit.
5. If the TDRE flag is cleared to 0, data is transferred from TDR to TSR, and serial transmission
6. If the TDRE flag is set to 1, the TEND flag in SSR is set to 1, and the TxD pin maintains the
Figure 15.17 shows a sample flow chart for serial data transmission. Even if the TDRE flag is
cleared to 0, transmission will not start while a receive error flag (ORER, FER, or PER) is set to 1.
Make sure to clear the receive error flags to 0 before starting transmission. Note that clearing the
RE bit to 0 does not clear the receive error flags.
TDR, and transfers the data from TDR to TSR.
transmission. If the TIE bit in SCR is set to 1 at this time, a TXI interrupt request is generated.
Because the TXI interrupt routine writes the next transmit data to TDR before transmission of
the current transmit data has finished, continuous transmission can be enabled.
mode has been specified and synchronized with the input clock when use of an external clock
has been specified.
of the next frame is started.
output state of the last bit. If the TEIE bit in SCR is set to 1 at this time, a TEI interrupt request
is generated. The SCK pin is fixed high.
Serial Data Transmission (Clocked Synchronous Mode)
Section 15 Serial Communication Interface (SCI and IrDA)
Rev. 3.00 Mar 21, 2006 page 395 of 788
REJ09B0300-0300