HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 417

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

• Receiving Serial Data (Synchronous Mode): Figure 12.18 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.
No
No
Clear RE bit to 0 in SCR
Read ORER flag in SSR
Read RDRF flag in SSR
Read receive data from
RDR, and clear RDRF
Finished receiving?
flag to 0 in SSR
Start receiving
ORER = 1
RDRF = 1
Initialize
<End>
Figure 12.18 Sample Flowchart for Serial Receiving (1)
No
Yes
Yes
(continued on next page)
Error handling
Yes
(5)
(1)
(2)
(4)
(3)
(1)
(2)(3)
(4)
(5)
Rev.4.00 Aug. 20, 2007 Page 373 of 638
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.
12. Serial Communication Interface
REJ09B0395-0400