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H8/3021 Datasheet(PDF) 360 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 360 Page - Renesas Technology Corp

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11. Serial Communication Interface
Rev.2.00 Mar. 22, 2007 Page 336 of 684
REJ09B0352-0200
11.2
Register Descriptions
11.2.1
Receive Shift Register (RSR)
RSR is an 8-bit register that receives serial data.
Bit
Read/Write
7
—
6
—
5
—
4
—
3
—
0
—
2
—
1
—
The SCI loads serial data input at the RxD pin into RSR in the order received, LSB (bit 0) first,
thereby converting the data to parallel data. When 1 byte has been received, it is automatically
transferred to RDR. The CPU cannot read or write RSR directly.
11.2.2
Receive Data Register (RDR)
RDR is an 8-bit register that stores received serial data.
Bit
Initial value
Read/Write
7
0
R
6
0
R
5
0
R
4
0
R
3
0
R
0
0
R
2
0
R
1
0
R
When the SCI finishes receiving 1 byte of serial data, it transfers the received data from RSR into
RDR for storage. RSR is then ready to receive the next data. This double buffering allows data to
be received continuously.
RDR is a read-only register. Its contents cannot be modified by the CPU. RDR is initialized to
H'00 by a reset and in standby mode.



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