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H8S2245 データシート(PDF) 450 Page - Renesas Technology Corp

部品番号 H8S2245
部品情報  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
PDF  818 Pages
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メーカー  RENESAS [Renesas Technology Corp]
ホームページ  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S2245 データシート(HTML) 450 Page - Renesas Technology Corp

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Section 12 Serial Communication Interface (SCI)
Rev.3.00 Mar. 26, 2007 Page 408 of 772
REJ09B0355-0300
12.2
Register Descriptions
12.2.1
Receive Shift Register (RSR)
7
—
6
—
5
—
4
—
3
—
0
—
2
—
1
—
Bit
R/W
:
:
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.
12.2.2
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
R/W
:
:
:
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, enables continuous receive
operations to 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 or module stop mode.



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