7733 datasheet(444/940 Pages) RENESAS

444 / 940 page

APPLICATIONS

7733 Group User’s Manual

17–37

Fig. 17.2.14 Approximate flowchart (3)

17.2 Serial I/O

Flag used to determine whether a data

reception error has occurred or not = “0”

Confirmed receive data is stored in [REC_DATA]

[F_ERROR]

“0”

0: No error is found.

1: Error is found.

Whether data has been correctly received

or not is determined.

[F_ERROR]: Flag used for determination of data reception error

[WORK_RAM]: RAM where receive data is temporarily stored

[REC_DATA]: RAM where confirmed receive data is stored

[F_DATAIN]: Flag used to determine whether a reception interrupt

request has occurred or not

[REC_DATA]

[WORK_RAM]

0: No error is found.

(Note)

[WORK_RAM]

UART1 receive buffer register

(address 3E16)

[F_DATAIN]

“1”

Flag used to determine whether a reception

interrupt request has occurred or not = “1”

RTI

UART1 reception interrupt routine

Error sum flag?

(bit 7 at address

3D16)

Overrun error flag?

(bit 4 at address

3D16)

1: Error is found.

[F_ERROR]

“1”

Reception enable bit

“0”

(

bit 2 at address 3D16)

All of error flags = “0”

(Reception is disabled.)

Receive data is temporarily stored in [WORK_RAM]

Framing error flag = “0”

Parity error flag = “0”

If the next data is received from when the error sum flag is checked until the contents of the UART1 receive buffer

Therefore, at this timing, the content of the overrun error flag is checked again.

Note:

Flag used to determine whether a

data reception error has occurred

or not = “1”

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