UPD78F0411GA-GAM-AX Datasheet, PDF (358/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 14 SERIAL INTERFACE UART6
(2) Communication operation
(a) Format and waveform example of normal transmit/receive data
Figures 14-15 and 14-16 show the format and waveform example of the normal transmit/receive data.
Figure 14-15. Format of Normal UART Transmit/Receive Data
1. LSB-first transmission/reception
1 data frame
Start
bit
D0
D1
D2
D3
D4 D5
D6
D7
Parity
bit
Character bits
Stop bit
2. MSB-first transmission/reception
1 data frame
Start
bit
D7
D6
D5
D4
D3 D2
D1
D0
Parity
bit
Character bits
Stop bit
One data frame consists of the following bits.
• Start bit ... 1 bit
• Character bits ... 7 or 8 bits
• Parity bit ... Even parity, odd parity, 0 parity, or no parity
• Stop bit ... 1 or 2 bits
The character bit length, parity, and stop bit length in one data frame are specified by asynchronous serial
interface operation mode register 6 (ASIM6).
Whether data is communicated with the LSB or MSB first is specified by bit 1 (DIR6) of asynchronous serial
interface control register 6 (ASICL6).
Whether the TXD6 pin outputs normal or inverted data is specified by bit 0 (TXDLV6) of ASICL6.
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User’s Manual U18698EJ1V0UD