RL78/D1A User's Manual: Hardware - Renesas

Under development
Preliminary document
Specifications in this document are tentative and subject to change.
RL78/D1A CHAPTER 13 ASYNCHRONOUS SERIAL INTERFACE LIN-UART (UARTF)
13.7.5 Multi-byte response transmission/reception function
In normal LIN communication, a response is no more than 9 bytes (including the checksum field); but in automatic baud
rate mode (UFnMD1, UFnMD0 = 11B), responses of at least 10 bytes can be transmitted and received.
The processing flow of initial settings and INTLSn generation is same as the basic processing flow. See 13.7 LIN
Communication Automatic Baud Rate Mode.
The response preparation error detection function, ID parity check function, and automatic checksum function are valid.
UFnTW = 0, UFnCON = 0,
UFnECS = ×, UFnNO = 1,
UFnRRQ = 0, UFnTRQ = 0,
UFnBUL3 to UFnBUL0 = ×H
(UFnBUCTL register)
Figure 13-64. Multi-Byte Transmission/Reception Processing Flow Example (1/2)
No
Note This can be omitted.
INTLRn processing
Read UFnSTR register
UFnHDC = 1?
Yes
Clear UFnHDC flag
(UFnSTC register)
Read UFnID register
Target PID?
END
Yes
Response received?
(Data length ≤ 9)
Yes
UFnTW = 0, UFnCON = 0,
UFnECS = ×, UFnNO = 0,
UFnRRQ = 1, UFnTRQ = 0,
UFnBUL3 to UFnBUL0 = ×H
(UFnBUCTL register)
Remark : don’t care, n = 0, 1
No
No
A B
Response received?
(Data length > 9)
Yes
UFnTW = 0, UFnCON = 1,
UFnECS = ×, UFnNO = 0,
UFnRRQ = 1, UFnTRQ = 0,
UFnBUL3 to UFnBUL0 = ×H
(UFnBUCTL register)
Read receive data Note
(UFnBUF0 to
UFnBUF8 registers)
Clear UFnBUC flag
(UFnSTC register)
R01UH0317EJ0004 Rev. 0.04 764
Feb. 22, 2013
No
TX
Last byte?
(UFnCON = 0)
END
Yes
No
Response received?
Yes
End upon next response?
Yes
No
No
A B C