r5f71374an80fpv Renesas Electronics Corporation., r5f71374an80fpv Datasheet - Page 652
r5f71374an80fpv
Manufacturer Part Number
r5f71374an80fpv
Description
32-bit Risc Microcomputer Superh?? Risc Engine Family
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R5F71374AN80FPV.pdf
(1154 pages)
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Section 15 Synchronous Serial Communication Unit (SSU)
(3)
Data Reception
Figure 15.7 shows an example of reception operation, and figure 15.8 shows a flowchart example
of data reception. When receiving data, the SSU operates as shown below.
After setting the RE bit to 1 and dummy-reading SSRDR, the SSU starts data reception.
In master mode, the SSU outputs a transfer clock and receives data. In slave mode, when a low
level signal is input to the SCS pin and a transfer clock is input to the SSCK pin, the SSU receives
data in synchronization with the transfer clock.
When 1-frame data has been received, the RDRF bit in SSSR is set to 1 and the receive data is
stored in SSRDR. At this time, if the RIE bit in SSER is set to 1, an RXI interrupt is generated.
The RDRF bit is automatically cleared to 0 by reading SSRDR.
When the RDRF bit has been set to 1 at the 8th rising edge of the transfer clock, the ORER bit in
SSSR is set to 1. This indicates that an overrun error (OEI) has occurred. At this time, data
reception is stopped. While the ORER bit in SSSR is set to 1, reception is not performed. To
resume the reception, clear the ORER bit to 0.
Rev. 1.00 Sep. 21, 2007 Page 626 of 1124
REJ09B0402-0100
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