NEC 78K0/KD1 Series User Manual page 257

(2) Communication operation
(a) Normal transmit/receive data format
Figure 13-5 shows the format of the 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 mode register 0 (ASIM0).
Figure 13-6. Example of Normal UART Transmit/Receive Data Format
1. Data length: 8 bits, Parity: Even parity, Stop bit: 1 bit, Transfer data: 55H
Start D0
2. Data length: 7 bits, Parity: Odd parity, Stop bit: 2 bits, Transfer data: 36H
Start D0
3. Data length: 8 bits, Parity: None, Stop bit: 1 bit, Transfer data: 87H
Start D0
CHAPTER 13 SERIAL INTERFACE UART0
Figure 13-5. 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
Preliminary User's Manual U16315EJ1V0UD
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
257