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Chapter 12
Serial Interface Function
Preliminary User’s Manual U14913EE1V0UM00
(8)
Transmission buffer registers 0 to 2 (TXB0 to TXB2)
TXBn is an 8-bit buffer for transmit data. A transmit operation is started by writing transmit data to
TXBn. The transmission completion interrupt request (INTSTn) is generated synchronized with the
completion of transmission of one frame.
(9)
Addition of transmission control parity
A transmit operation is controlled by adding a start bit, parity bit, or stop bit to the data that is written
to the TXBn register, according to the contents that were set in the ASIMn register.
Figure 12-1: Asynchronous Serial Interfaces 0 to 2 Block Diagram
Remark:
n = 0 to 2
Parity
Framing
Overrun
Internal bus
Asynchronous serial interface
mode register n (ASIMn)
Reception buffer
register n (RXBn)
Reception
shift register
Reception control
parity check
Transmission buffer
register n (TXBn)
Transmission
shift register
Addition of transmission
control parity
BRG
INTSERn
INTSRn
INTSTn
RXDn
TXDn
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