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[When not using interrupts]
Checking start of transmission
UART0 transmit interrupt control register (Address 71
UART1 transmit interrupt control register (Address 73
b7
Checking completion of transmission.
UART0 transmit/receive control register 0 (Address 34
UART1 transmit/receive control register 0 (Address 3C
b7
0
Processing at completion of transmission
Fig. 7.4.5 Detection of transmission's completion
7.4 Clock asynchronous serial I/O (UART) mode
)
16
)
16
b0
Interrupt request bit
0:
No interrupt request
1:
Interrupt request
(Transmission has started.)
)
16
)
16
b0
Transmit register empty flag
0: During transmitting
1: Transmitting completed
7751 Group User's Manual
[When using interrupts]
The UARTi transmit interrupt request
occurs when the transmission starts.
UARTi transmit interrupt
Note : This figure shows the bits and registers required
for processing.
Refer to Figures 7.4.6 to 7.4.7 about the
change of flag state and the occurrence timing
of an interrupt request.
SERIAL I/O
7–43
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