HD6432621 Hitachi, HD6432621 Datasheet - Page 466
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HD6432621
Manufacturer Part Number
HD6432621
Description
(HD64F262x Series) 16-Bit Microcomputer
Manufacturer
Hitachi
Datasheet
1.HD6432621.pdf
(1069 pages)
- Current page: 466 of 1069
- Download datasheet (5Mb)
13.2
13.2.1
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.
13.2.2
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, in standby mode, watch mode, subactive mode, subsleep
mode, or module stop mode.
422
Bit
Initial value
R/W
Bit
R/W
Register Descriptions
Receive Shift Register (RSR)
Receive Data Register (RDR)
:
:
:
:
:
—
7
R
7
0
—
6
R
6
0
—
5
R
5
0
—
4
R
4
0
—
3
R
3
0
—
2
R
2
0
—
1
R
1
0
—
0
R
0
0
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