7733 datasheet(447/940 Pages) RENESAS

447 / 940 page

APPLICATIONS

7733 Group User’s Manual

17–40

(3) Approximate flowchart

Port P4 register

“!!!!1!!!2”

(

address A16)

Waiting for the start of transmission

Transmit data is set.

Main routine

Transmission buffer empty flag = “1” ?

(bit 1 at address 3D 16)

Transmission register empty flag = “1” ?

(bit 3 at address 3C 16)

1: Transfer is completed.

UART1 transmission buffer register

[Transmit data 2]

(

address 3A16)

Transmission buffer empty flag = “1” ?

(bit 1 at address 3D 16)

1: Transfer is completed.

1: Transmission is completed.

16-bit data is transmitted by the 8 bits in two operations.

Waiting for the completion of transmission

Strobe signal’s level: “H”

Transmit data is set.

Waiting for the completion of transmission

Waiting for the start of transmission

UART1 transmission buffer register

[Transmit data 1]

(

address 3A16)

Waiting

Port P4 register

“XXXX0XXX 2”

(address A16)

Strobe signal’s level: “L”

Port P4 register

“XXXX1XXX 2”

(address A16)

Strobe signal’s level: “H”

Waiting

Port P4 register

“XXXX0XXX 2”

(address A16)

Strobe signal’s level: “L”

NOP instruction or others are used.

“H” level output time for a strobe signal is set.

NOP instruction or others are used.

“H” level output time for a strobe signal is set.

Transmission register empty flag = “1”

(bit 3 at address 3C 16)

X: It may be “0” or “1.”

17.2 Serial I/O

Fig. 17.2.18 Approximate flowchart

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