7733 datasheet(439/940 Pages) RENESAS

439 / 940 page

APPLICATIONS

7733 Group User’s Manual

17–32

(3) Approximate flowchart

Transmission buffer

empty flag = “1” ?

(bit 1 at address 35 16)

Serial transmit control register

“XX01XXXX 2”

(address 6E16)

Main routine

Transfer clock is output from pin CLK 0.

(Data is transmitted to peripheral IC1.)

UART0 transmission buffer register

[Transmit data 1]

(address 3216)

Transmission register

empty flag = “1” ?

(bit 3 at address 34 16)

1: Transfer is completed.

Serial transmit control register

“XX10XXXX 2”

(address 6E16)

UART0 transmission buffer register

[Transmit data 2]

(address 3216)

Transmission register

empty flag = “1” ?

(bit 3 at address 34 16)

1: Transfer is completed.

1: Transmission is completed.

At first, transmit data 1 is transmitted to peripheral IC1,

and then transmit data 2 is transmitted to peripheral IC2.

Transmit data is set.

Waiting for the completion of transmission

Waiting for the start of transmission

Transfer clock is output from pin CLKS 0.

(Data is transmitted to peripheral IC2.)

Transmit data is set.

Waiting for the completion of transmission

Waiting for the start of transmission

Transmission buffer

empty flag = “1” ?

(bit 1 at address 35 16)

X: It may be “0” or “1.”

Fig. 17.2.9 Approximate flowchart

17.2 Serial I/O

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