UPD78F0411GA-GAM-AX Datasheet, PDF (327/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 13 SERIAL INTERFACE UART0
(2) Communication operation
(a) Format and waveform example of normal transmit/receive data
Figures 13-7 and 13-8 show the format and waveform example of the normal transmit/receive data.
Figure 13-7. Format of Normal UART Transmit/Receive Data
1 data frame
Start
bit
D0
D1
D2
D3
D4 D5
D6
D7
Parity
bit
Character bits
Stop bit
One data frame consists of the following bits.
• Start bit ... 1 bit
• Character bits ... 7 or 8 bits (LSB first)
• 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 0 (ASIM0).
Figure 13-8. Example of Normal UART Transmit/Receive Data Waveform
1. Data length: 8 bits, Parity: Even parity, Stop bit: 1 bit, Communication data: 55H
1 data frame
Start
D0
D1
D2
D3
D4
D5
D6
D7
Parity Stop
2. Data length: 7 bits, Parity: Odd parity, Stop bit: 2 bits, Communication data: 36H
1 data frame
Start
D0
D1
D2
D3
D4
D5
D6
Parity Stop Stop
3. Data length: 8 bits, Parity: None, Stop bit: 1 bit, Communication data: 87H
1 data frame
Start
D0
D1
D2
D3
D4
D5
D6
D7
Stop
User’s Manual U18698EJ1V0UD
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