h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 498

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

Section 15 Serial Communication Interface (SCI, IrDA)
Rev. 4.00 Jun 06, 2006 page 444 of 1004
REJ09B0301-0400
[3]
No
No
Read receive data in RDR, and
Clear ORER flag in SSR to 0
clear RDRF flag in SSR to 0
Read ORER flag in SSR
Read RDRF flag in SSR
Clear RE bit in SCR to 0
Overrun error handling
All data received?
Start reception
Error handling
Initialization
ORER = 1?
RDRF = 1?
Figure 15.18 Sample Serial Reception Flowchart
<End>
<End>
Yes
Yes
No
(Continued below)
Error handling
Yes
[2]
[1]
[3]
[4]
[5]
[1]
[2] [3]
[4]
[5]
The RxD pin is automatically
designated as the receive data
input pin.
If a receive error occurs, read the
ORER flag in SSR , and after
performing the appropriate error
handling, clear the ORER flag to
0. Transfer cannot be resumed if
the ORER flag is set to 1.
SCI status check and receive
data read:
Read SSR and check that the
RDRF flag is set to 1, then read
the receive data in RDR and
clear the RDRF flag to 0.
Transition of the RDRF flag from
0 to 1 can also be identified by
an RXI interrupt.
Serial reception continuation
procedure:
To continue serial reception,
before the MSB (bit 7) of the
current frame is received, finish
reading the RDRF flag, reading
RDR, and clearing the RDRF flag
to 0. The RDRF flag is cleared
automatically when the DTC is
activated by a receive-data-full
interrupt (RXI) request and the
RDR value is read.
SCI initialization:
Receive error handling: