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RL78/D1A User's Manual: Hardware - Renesas

RL78/D1A User's Manual: Hardware - Renesas

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Under development<br />

Preliminary document<br />

Specifications in this document are tentative and subject to change.<br />

<strong>RL78</strong>/<strong>D1A</strong> CHAPTER 13 ASYNCHRONOUS SERIAL INTERFACE LIN-UART (UARTF)<br />

(16) LIN-UARTn buffer registers 0 to 8 (UFnBUF0 to UFnBUF8)<br />

The UFnBUF0 to UFnBUF8 registers are 8-bit buffer registers.<br />

These registers can be used when transmitting data in normal UART mode (UFnMD1 and UFnMD0 = 00B) and<br />

when transmitting and receiving data in automatic baud rate mode (UFnMD1 and UFnMD0 = 11B).<br />

When in normal UART mode (UFnMD1, UFnMD0 = 00B), data will be sequentially transmitted from the UFnBUF0<br />

register by setting the UFnTRQ bit.<br />

When in automatic baud rate mode (UFnMD1, UFnMD0 = 11B) and during response transmission (UFnTRQ = 1),<br />

the transmit data in UFnBUF0 will be transmitted sequentially, but the received data will not be stored.<br />

When in automatic baud rate mode (UFnMD1, UFnMD0 = 11B) and during response reception (UFnRRQ = 1), the<br />

received data will be stored sequentially, starting from the UFnBUF0 register.<br />

See 13.6.1 UART buffer mode transmission and 13.7 LIN Communication Automatic Baud Rate Mode for<br />

details.<br />

These registers can be read or written in 8-bit units.<br />

Reset input sets these registers to 00H.<br />

Figure 13-16. Format of LIN-UARTn Buffer Registers 0 to 8 (UFnBUF0 to UFnBUF8)<br />

Address: F024FH (UF0BUF0), F0250H (UF0BUF1), After reset: 00H R/W<br />

UFnBUFm<br />

(n = 0, 1, m = 0 to 8)<br />

F0251H (UF0BUF2), F0252H (UF0BUF3),<br />

F0253H (UF0BUF4), F0254H (UF0BUF5),<br />

F0255H (UF0BUF5), F0256H (UF0BUF7),<br />

F0257H (UF0BUF8)<br />

F026FH (UF1BUF0), F0270H (UF1BUF1),<br />

F0271H (UF1BUF2), F0272H (UF1BUF3),<br />

F0273H (UF1BUF4), F0274H (UF1BUF5),<br />

F0275H (UF1BUF6), F0276H (UF1BUF7),<br />

F0277H (UF1BUF8)<br />

7 6 5 4 3 2 1 0<br />

Caution These registers cannot be used when expansion bits are enabled (UFnEBE = UFnCL = 1).<br />

R01UH0317EJ0004 Rev. 0.04 710<br />

Feb. 22, 2013

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