HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 762
HD6412373R
Manufacturer Part Number
HD6412373R
Description
Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
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Section 15 Serial Communication Interface (SCI, IrDA)
• Transmit shift register_3 (TSR_3)
• Receive data register_3 (RDR_3)
• Transmit data register_3 (TDR_3)
• Serial mode register_3 (SMR_3)
• Serial control register_3 (SCR_3)
• Serial status register_3 (SSR_3)
• Smart card mode register_3 (SCMR_3)
• Bit rate register_3 (BRR_3)
• Receive shift register_4 (RSR_4)
• Transmit shift register_4 (TSR_4)
• Receive data register_4 (RDR_4)
• Transmit data register_4 (TDR_4)
• Serial mode register_4 (SMR_4)
• Serial control register_4 (SCR_4)
• Serial status register_4 (SSR_4)
• Smart card mode register_4 (SCMR_4)
• Bit rate register_4 (BRR_4)
15.3.1
RSR is a shift register used to receive serial data that is input to the RxD pin and convert it into
parallel data. When one byte of data has been received, it is transferred to RDR automatically.
RSR cannot be directly accessed by the CPU.
15.3.2
RDR is an 8-bit register that stores receive data. When the SCI has received one byte of serial
data, it transfers the received serial data from RSR to RDR where it is stored. After this, RSR is
receive-enabled. Since RSR and RDR function as a double buffer in this way, enables continuous
receive operations to be performed. After confirming that the RDRF bit in SSR is set to 1, read
RDR for only once. RDR cannot be written to by the CPU.
15.3.3
TDR is an 8-bit register that stores transmit data. When the SCI detects that TSR is empty, it
transfers the transmit data written in TDR to TSR and starts transmission. The double-buffered
structures of TDR and TSR enable continuous serial transmission. If the next transmit data has
Rev.7.00 Mar. 18, 2009 page 694 of 1136
REJ09B0109-0700
Receive Shift Register (RSR)
Receive Data Register (RDR)
Transmit Data Register (TDR)
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