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HD64F2149YV 데이터시트(PDF) 458 Page - Renesas Technology Corp

부품명 HD64F2149YV
상세설명  Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD64F2149YV 데이터시트(HTML) 458 Page - Renesas Technology Corp

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Section 15 Serial Communication Interface (SCI, IrDA)
Rev. 3.00 Jan 18, 2006 page 430 of 1044
REJ09B0280-0300
15.2
Register Descriptions
15.2.1
Receive Shift Register (RSR)
7
—
6
—
5
—
4
—
3
—
0
—
2
—
1
—
Bit
Read/Write
RSR is a register used to receive serial data.
The SCI sets serial data input from the RxD pin in RSR in the order received, starting with the
LSB (bit 0), and converts it to parallel data. When one byte of data has been received, it is
transferred to RDR automatically.
RSR cannot be directly read or written to by the CPU.
15.2.2
Receive Data Register (RDR)
7
0
R
6
0
R
5
0
R
4
0
R
3
0
R
0
0
R
2
0
R
1
0
R
Bit
Initial value
Read/Write
RDR is a register that stores received serial 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, and completes the receive operation. After this, RSR is receive-enabled.
Since RSR and RDR function as a double buffer in this way, continuous receive operations can be
performed.
RDR is a read-only register, and cannot be written to by the CPU.
RDR is initialized to H'00 by a reset, and in standby mode, watch mode, subactive mode, subsleep
mode, and module stop mode.



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