H8S2110B RENESAS [Renesas Technology Corp], H8S2110B Datasheet - Page 299
H8S2110B
Manufacturer Part Number
H8S2110B
Description
Renesas 16-Bit Single-Chip Microcomputer Renesas H8S Family/H8S/2100 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.H8S2110B.pdf
(559 pages)
- Current page: 299 of 559
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Figure 12.20 Sample Flowchart of Simultaneous Serial Transmission and Reception
Note: * When switching from transmit or receive operation to simultaneous
transmit and receive operations, first clear the TE bit and RE bit to 0,
then set both these bits to 1 simultaneously.
No
No
No
Clear TE and RE bits in SCR to 0
Read receive data in RDR, and
Write transmit data to TDR and
Start transmission/reception
clear TDRE flag in SSR to 0
clear RDRF flag in SSR to 0
Read ORER flag in SSR
Read TDRE flag in SSR
Read RDRF flag in SSR
All data received?
Initialization
ORER = 1
TDRE = 1
RDRF = 1
<End>
Yes
Yes
Yes
No
Error processing
Yes
[1]
[2]
[4]
[5]
Section 12 Serial Communication Interface (SCI)
[3]
Rev. 2.00 Mar 21, 2006 page 261 of 518
[1] SCI initialization:
[2] SCI status check and transmit data
[3] Receive error processing:
[4] SCI status check and receive data
[5] Serial transmission/reception
The TxD pin is designated as the
transmit data output pin, and the RxD
pin is designated as the receive data
input pin, enabling simultaneous
transmit and receive operations.
write:
Read SSR and check that the TDRE
flag is set to 1, then write transmit
data to TDR and clear the TDRE flag
to 0.
Transition of the TDRE flag from 0 to
1 can also be identified by a TXI
interrupt.
If a receive error occurs, read the
ORER flag in SSR, and after
performing the appropriate error
processing, clear the ORER flag to 0.
Transmission/reception cannot be
resumed if the ORER flag is set to 1.
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.
continuation procedure:
To continue serial transmission/
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. Also,
before the MSB (bit 7) of the current
frame is transmitted, read 1 from the
TDRE flag to confirm that writing is
possible. Then write data to TDR and
clear the TDRE flag to 0.
REJ09B0299-0200
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