H8SLASH3028F datasheet(532/923 Pages) RENESAS

532 / 923 page

Rev. 2.00, 09/03, page 502 of 890

Receiving Serial Data (Synchronous Mode): Figure 13.18 shows a sample flowchart for

receiving serial data and indicates the procedure to follow. When switching from asynchronous to

synchronous mode. make sure that the ORER, PER, and FER flags are cleared to 0. If the FER or

PER flag is set to 1 the RDRF flag will not be set and both transmitting and receiving will be

disabled.

Yes

<End>

Clear RE bit to 0 in SCR

Finished receiving?

(2)

(1)

Initialize

(4)

(3)

(5)

(1)

(2)(3)

(4)

(5)

Start receiving

Error handling

ORER = 1

RDRF = 1

Read RDRF flag in SSR

Read ORER flag in SSR

(continued on next page)

Read receive data from

RDR, and clear RDRF

flag to 0 in SSR

Yes

SCI initialization: the receive data

input function of the RxD pin is

selected automatically.

Receive error handling: if a receive

error occurs, read the ORER flag in

SSR, then after executing the

necessary error handling, clear the

ORER flag to 0. Neither transmitting

nor receiving can resume while the

ORER flag remains set to 1.

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

MSB (bit 7) 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.

Figure 13.18 Sample Flowchart for Serial Receiving (1)

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