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10.3.5 Operation
(1) Data format
Full-duplex serial data is transmitted and received.
Figure 10-16 shows the format of transmit/receive data. One data frame consists of a start bit, character bits,
a parity bit, and a stop bit(s). When 2 data frame transfer is set, both frames have the above-described
format.
Specification of the character bit length in one data frame, parity selection, and specification of the stop bit
length is done using asynchronous serial interface mode registers 10, 20 (ASIM10, ASIM20). Specification of
the number of frames and specification of the extension bit is done with asynchronous serial interface mode
registers 11, 21 (ASIM11, ASIM21). Data is transmitted LSB first.
Figure 10-16. Asynchronous Serial Interface Transmit/Receive Data Format
(a) 1-frame format
Data
(b) 2-frame format
Data
Start
D8 D9 D10 D11 D12 D13 D14 D15
bit
⋅ Start bit: 1 bit
⋅ Character bits: 7 or 8 bits
⋅ Parity bit: Even parity, odd parity, 0 parity, or no parity
⋅ Stop bit: 1 or 2 bits
Caution The extension bit is invalid in the 2-frame continuous mode or when a parity bit is added.
CHAPTER 10 SERIAL INTERFACE FUNCTION
Start
D0
D1
D2
D3
bit
Higher frame
Parity
bit
User's Manual U14492EJ3V0UD
1 frame
D4
D5
D6
D7
Parity/
extension
bit
Lower frame
Stop
Start
D0 D1 D2 D3 D4 D5 D6 D7
bit
bit
Stop bit
Parity
Stop
bit
bit
459
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