CHAPTER 11 SERIAL INTERFACE UART6
User’s Manual U16898EJ3V0UD
198
(c) Normal transmission
When bit 7 (POWER6) of asynchronous serial interface operation mode register 6 (ASIM6) is set to 1, and
then bit 6 (TXE6) of ASIM6 is set to 1, transmission is enabled. Transmission can be started by writing
transmit data to transmit buffer register 6 (TXB6). The start bit, parity bit, and stop bit are automatically
appended to the data.
When transmission is started, the data in TXB6 is transferred to transmit shift register 6 (TXS6). After that,
the data is sequentially output from TXS6 to the T
X
D6 pin. When transmission is completed, the parity and
stop bits set by ASIM6 are appended and a transmission completion interrupt request (INTST6) is generated.
Transmission is stopped until the data to be transmitted next is written to TXB6.
Figure 11-15 shows the timing of the transmission completion interrupt request (INTST6). This interrupt
occurs as soon as the last stop bit has been output.
Figure 11-15. Normal Transmission Completion Interrupt Request Timing
1. Stop bit length: 1
INTST6
D0
Start
D1
D2
D6
D7
Stop
T
X
D6 (output)
Parity
2. Stop bit length: 2
T
X
D6 (output)
INTST6
D0
Start
D1
D2
D6
D7
Parity
Stop