H8SX1663 datasheet(713/1158 Pages) RENESAS

713 / 1158 page

Section 15 Serial Communication Interface (SCI, IrDA, CRC)

Rev.1.00 Jun. 07, 2006 Page 661 of 1102

REJ09B0294-0100

Channel 6:

• Receive shift register_6 (RSR_6)

• Transmit shift register_6 (TSR_6)

• Receive data register_6 (RDR_6)

• Transmit data register_6 (TDR_6)

• Serial mode register_6 (SMR_6)

• Serial control register_6 (SCR_6)

• Serial status register_6 (SSR_6)

• Smart card mode register_6 (SCMR_6)

• Serial extended mode register_6 (SEMR_6)

• Bit rate register_6 (BRR_6)

15.3.1

Receive Shift Register (RSR)

RSR is a shift register which is used to receive serial data input from the RxD pin and converts it

into parallel data. When one frame of data has been received, it is transferred to RDR

automatically. RSR cannot be directly accessed by the CPU.

15.3.2

Receive Data Register (RDR)

RDR is an 8-bit register that stores receive data. When the SCI has received one frame of serial

data, it transfers the received serial data from RSR to RDR where it is stored. This allows RSR to

receive the next data. Since RSR and RDR function as a double buffer in this way, continuous

receive operations can be performed. After confirming that the RDRF bit in SSR is set to 1, read

RDR only once. RDR cannot be written to by the CPU.

Bit

Bit Name

Initial Value

R/W

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