SERIAL I/O
11.4 Clock asynchronous serial I/O (UART) mode
[When using interrupts]
[When not using interrupts]
A UARTi transmit interrupt request
occurs when the transmission starts.
Checking start of transmission
UART0 transmit interrupt control register (Address 7116
UART1 transmit interrupt control register (Address 7316
)
)
UARTi transmit interrupt
b7
b
0
Interrupt request bit
0: No interrupt requested
1: Interrupt requested
(Transmission has started.)
Note:
This figure shows the bits and registers required
for processing.
Checking completion of transmission.
UART0 transmit/receive control register 0 (Address 3416
UART1 transmit/receive control register 0 (Address 3C16
)
)
See Figures 11.4.7 to 11.4.9 for the change of
flag state and the occurrence timing of an interrupt
request.
b7
0
b0
0
Transmit register empty flag
0: Transmission is in progress.
1: Transmission is completed.
Processing at completion of transmission
Fig. 11.4.6 Detect operation of transmit completion
7906 Group User’s Manual Rev.2.0
11-43
RENESAS [ RENESAS TECHNOLOGY CORP ]
