H8SLASH3028F datasheet(518/923 Pages) RENESAS

518 / 923 page

Rev. 2.00, 09/03, page 488 of 890

Receiving Serial Data (Asynchronous Mode): Figure 13.7 shows a sample flowchart for

receiving serial data and indicates the procedure to follow.

Yes

<End>

All data received?

(2)

(1)

Initialize

(4)

(5)

(1)

(2)(3)

(4)

(5)

Start receiving

Error handling

Read ORER, PER, and FER

flags in SSR

PER

∨ FER ∨ OPER = 1

RDRF = 1

Read RDRF flag in SSR

(continued on next page)

Read receive data from RDR, and

clear RDRF flag to 0 in SSR

Yes

(3)

SCI initialization:

the receive data input function of the RxD

pin is selected automatically.

Receive error handling and break detection:

if a receive error occurs, read the ORER,

PER, and FER flags in SSR to identify the

error. After executing the necessary error

handling, clear the ORER, PER, and FER

flags all to 0. Receiving cannot resume if

any of these flags remains set to 1. When a

framing error occurs, the RxD pin can be

read to detect the break state.

SCI status check and receive data read:

read SSR, check that the RDRF flag is set

to 1, then read receive data from RDR and

clear the RDRF flag to 0. Notification that

the RDRF flag has changed from 0 to 1 can

also be given by the RXI interrupt.

To continue receiving serial data:

check the RDRF flag, read RDR, and clear

the RDRF flag to 0 before the stop bit of the

current frame is received. When the DMAC

is activated by a receive-data-full interrupt

request (RXI) to read RDR, the RDRF flag

is cleared automatically.

Clear RE bit to 0 in SCR

Figure 13.7 Sample Flowchart for Receiving Serial Data (1)

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