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7721 Group User’s Manual

11–43

SERIAL I/O

11.4 Clock asynchronous serial I/O (UART) mode

Fig. 11.4.10 Processing after receive completion

[When not using interrupts]

[When using interrupts]

A UARTi receive interrupt request

occurs when reception is completed.

UARTi receive interrupt

Processing after reading out receive data

UART0 receive buffer register (Addresses 3716, 3616)

UART1 receive buffer register (Addresses 3F16, 3E16)

b15

Reading of receive data

Read out receive data.

UART0 transmit/receive control register 1 (Address 3516)

UART1 transmit/receive control register 1 (Address 3D16)

Receive complete flag

0 : Reception not completed

1 : Reception completed

Checking completion of reception

UART0 transmit/receive control register 1 (Address 3516)

UART1 transmit/receive control register 1 (Address 3D16)

Checking error

Framing error flag

Parity error flag

Error sum flag

0 : No error

1 : Error detected

Note : This figure shows the bits and registers required

for processing.

Refer to “Figure 11.4.12” for the change of flag

state and the occurrence timing of an interrupt

request.

UART0 transmit/receive control register 1 (Address 3516)

UART1 transmit/receive control register 1 (Address 3D16)

Checking error

Overrun error flag

0 : No overrun error

1 : Overrun error detected

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