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10.2.5 Operation
(1) Data format
Full-duplex serial data transmission and reception can be performed.
The transmit/receive data format consists of one data frame containing a start bit, character bits, a parity bit,
and stop bits as shown in Figure 10-3.
The character bit length within one data frame, the type of parity, and the stop bit length are specified
according to asynchronous serial interface mode register 0 (ASIM0).
Also, data is transferred with LSB first.
Figure 10-3. Asynchronous Serial Interface Transmit/Receive Data Format
Start
• Start bit ··· 1 bit
• Character bits ··· 7 bits or 8 bits
• Parity bit ··· Even parity, odd parity, 0 parity, or no parity
• Stop bits ··· 1 bit or 2 bits
CHAPTER 10 SERIAL INTERFACE FUNCTION
D0
D1
D2
D3
bit
Character bits
User's Manual U15195EJ5V0UD
1 data frame
Parity
D4
D5
D6
D7
bit
Stop bits
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