CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U13850EJ6V0UD
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(c) Transmission
The transmit operation is started when transmit data is written to transmit shift register n (TXSn). A start bit,
parity bit, and stop bit(s) are automatically added to the data.
Starting the transmit operation shifts out the data in TXSn, thereby emptying TXSn, after which a transmit
completion interrupt (INTSTn) is issued.
The timing of the transmit completion interrupt is shown below.
Figure 10-52. Timing of Asynchronous Serial Interface Transmit Completion Interrupt
TxDn (output)
D0
D1
D2
D6
D7
Parity
STOP
START
INTSTn
(a) Stop bit length: 1
TxDn (output)
D0
D1
D2
D6
D7
Parity
START
INTSTn
(b) Stop bit length: 2
STOP
Caution
Do not write to asynchronous serial interface mode register n (ASIMn) during a transmit
operation. Writing to ASIMn during a transmit operation may disable further transmit
operations (in such cases, input RESET to restore normal operation).
Whether or not a transmit operation is in progress can be determined via software using
the transmit completion interrupt (INTSTn) or the interrupt request flag (STIFn) that is set
by INTSTn.
Remark
n = 0, 1
Содержание V850/SB1
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