CHAPTER 14 ASYNCHRONOUS SERIAL INTERFACE (UART)
User’s Manual U16896EJ2V0UD
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14.5 Operation
14.5.1 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 14-2.
The character bit length within one data frame, the type of parity, and the stop bit length are specified according to
the ASIMn register.
Also, data is transferred LSB first.
Figure 14-2. Format of UARTn Transmit/Receive Data
1 data frame
Start
bit
D0
D1
D2
D3
D4
D5
D6
D7
Parity
bit
Stop bits
Character bits
•
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