HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 430
HD6412340
Manufacturer Part Number
HD6412340
Description
H8S/2345 F-ZTAT Hardware Manual
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD6412340.pdf
(907 pages)
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12.2
12.2.1
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.
12.2.2
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, and in standby mode or module stop mode.
416
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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