CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U12688EJ4V0UM00
292
(3) Receive buffers 0, 0L, 1, 1L (RXB0, RXB0L, RXB1, RXB1L)
RXBn are 9-bit buffer registers that hold receive data, with a 0 stored in the higher bits when 7 or 8-bit
character data is received (n = 0, 1).
During 16-bit access of these registers, specify RXB0 and RXB1, and during lower 8-bit access, specify
RXB0L and RXB1L.
While in the reception enabled state, receive data is transmitted from the receive shift register to the receive
buffer in synchronization with the end of shift-in processing of 1 frame.
Also, a reception complete interrupt request (INTSRn) is generated by transfer of receive data to the receive
buffer.
In the reception disabled state, transmission of receive data to the receive buffer is not performed even if shift-
in processing of 1 frame is completed, and the contents of the receive buffer are held.
Also, a reception complete interrupt request is not generated.
RXB0 and RXB1 are read-only registers in 16-bit units, and RXB0L and RXB1L are read-only registers in 8- or
1-bit units.
15
0
RXB0
Address
FFFFF0C8H
After reset
Undefined
14
0
13
0
12
0
11
0
10
0
9
0
8
RXEB0
7
RXB07
6
RXB06
5
RXB05
4
RXB04
3
RXB03
2
RXB02
1
RXB01
0
RXB00
RXB0L
FFFFF0CAH
Undefined
7
RXB07
6
RXB06
5
RXB05
4
RXB04
3
RXB03
2
RXB02
1
RXB01
0
RXB00
15
0
RXB1
FFFFF0D8H
Undefined
14
0
13
0
12
0
11
0
10
0
9
0
8
RXEB1
7
RXB17
6
RXB16
5
RXB15
4
RXB14
3
RXB13
2
RXB12
1
RXB11
0
RXB10
RXB1L
FFFFF0DAH
Undefined
7
RXB17
6
RXB16
5
RXB15
4
RXB14
3
RXB13
2
RXB12
1
RXB11
0
RXB10
Bit Position
Bit Name
Function
8
RXEBn
Receive Extended Buffer
This is the expansion bit during reception of 9-bit/character data.
A 0 can be read in reception of 7 and 8-bit/character data.
7 to 0
RXBn7 to
RXBn0
Receive Buffer
This stores receive data.
A 0 can be read when RXBn7 is receiving 7-bit/character data.
Remark
n = 0, 1
Summary of Contents for V850E/MS1 UPD703100
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