Format Of Normal Uart Transmit/Receive Data; Example Of Normal Uart Transmit/Receive Data Waveform - NEC 78K0 User Manual

(2) Communication operation
(a) Format and waveform example of normal transmit/receive data
Figures 14-6 and 14-7 show the format and waveform example of the normal transmit/receive data.
Start
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 14-7. Example of Normal UART Transmit/Receive Data Waveform
1. Data length: 8 bits, Parity: Even parity, Stop bit: 1 bit, Communication data: 55H
Start D0
2. Data length: 7 bits, Parity: Odd parity, Stop bit: 2 bits, Communication data: 36H
Start D0
3. Data length: 8 bits, Parity: None, Stop bit: 1 bit, Communication data: 87H
Start D0
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CHAPTER 14 SERIAL INTERFACE UART0
Figure 14-6. Format of Normal UART Transmit/Receive Data
1 data frame
D0 D1 D2 D3
Character bits
1 data frame
D1 D2 D3
1 data frame
D1 D2 D3
1 data frame
D1 D2 D3
User's Manual U15947EJ2V0UD
Parity
D4 D5 D6 D7
bit
*
D4 D5 D6
D4 D5 D6
D4 D5 D6
Stop bit
D7 Parity Stop
Parity Stop Stop
D7 Stop