CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U14492EJ3V0UD
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(4) 2-frame continuous reception buffer registers 1, 2 (RXB1, RXB2)/reception buffer registers L1, L2
(RXBL1, RXBL2)
The RXBn register is a 16-bit buffer register that holds receive data (during 2-frame continuous reception
(UMSR bit of ASIMn1 register = 1), during 9-bit extended data reception (EBS bit of ASIMn1 register = 1)) (n
= 1, 2). During 7 or 8 bit/character reception, 0 is stored in the MSB.
For 16-bit access to this register, specify RXBn, and for access to the lower 8 bits, specify RXBLn.
In the receive enabled status, receive data is transferred from the reception shift register to the reception
buffer in synchronization with the end of shift-in processing for 1 frame of data.
The reception completion interrupt request (INTSRn) is generated upon transfer of data to the reception
buffer (when 2-frame continuous reception is specified, reception buffer transfer of the second frame).
In the reception disabled status, transfer processing to the reception buffer is not performed even if shift-in
processing for 1 frame of data has been completed, and the contents of the reception buffer are held.
Neither is a reception completion interrupt request generated.
The RXBn register is read-only in 16-bit units, and the RXBLn register is read-only in 8-bit units.