h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 478

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 Serial Communication Interface (SCI, IrDA)
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. The SCI checks the TDRE flag at the timing for sending the stop bit.
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TDR, and transfers the data from TDR to TSR.
transmission.
If the TIE bit is set to 1 at this time, a transmit data empty interrupt (TXI) is generated.
The serial transmit data is sent from the TxD pin in the following order.
a. Start bit:
b. Transmit data:
c. Parity bit or multiprocessor bit:
d. Stop bit(s):
e. Mark state:
If the TDRE flag is cleared to 0, the data is transferred from TDR to TSR, the stop bit is sent,
and then serial transmission of the next frame is started.
If the TDRE flag is set to 1, the TEND flag in SSR is set to 1, the stop bit is sent, and then the
mark state is entered in which 1 is output continuously. If the TEIE bit in SCR is set to 1 at this
time, a TEI interrupt request is generated.
One 0-bit is output.
8-bit or 7-bit data is output in LSB-first order.
One parity bit (even or odd parity), or one multiprocessor bit is output.
A format in which neither a parity bit nor a multiprocessor bit is output can also be
selected.
One or two 1-bits (stop bits) are output.
1 is output continuously until the start bit that starts the next transmission is sent.