303
CHAPTER 16 SERIAL INTERFACE UART0
User’s Manual U15798EJ2V0UD
(c) Transmission
The transmit operation is enabled if bit 7 (TXE0) of asynchronous serial interface mode register 0 (ASIM0)
is set to 1, the transmit operation is started when transmit data is written to transmit shift register 0 (TXS0).
A start bit, parity bit, and stop bit(s) are automatically added to the data.
Starting the transmit operation shifts out the data in TXS0, thereby emptying TXS0, after which a transmit
completion interrupt request (INTST0) is issued.
The timing of the transmit completion interrupt request is shown in Figure 16-8.
Figure 16-8. Timing of Asynchronous Serial Interface Transmit Completion Interrupt Request
(i)
Stop bit length: 1 bit
TxD0 (output)
D0
D1
D2
D6
D7
Parity
STOP
START
INTST0
TxD0 (output)
D0
D1
D2
D6
D7
Parity
START
INTST0
STOP
Caution Do not rewrite asynchronous serial interface mode register 0 (ASIM0) during a transmit
operation. Rewriting ASIM0 register during a transmit operation may disable further
transmit operations (in such cases, enter a RESET to restore normal operation).
(ii) Stop bit length: 2 bits
Содержание mPD780344 Series
Страница 2: ...2 User s Manual U15798EJ2V0UD MEMO...