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R8C/20 Datasheet(PDF) 315 Page - Renesas Technology Corp |
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R8C/20 Datasheet(HTML) 315 Page - Renesas Technology Corp |
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315 / 501 page  R8C/20 Group, R8C/21 Group 16. Clock Synchronous Serial Interface Rev.2.00 Aug 27, 2008 Page 299 of 458 REJ09B0250-0200 Figure 16.14 Sample Flowchart of Data Transmission (Clock Synchronous Communication Mode) Start Initialization Read TDRE bit in SSSR register SSSR register TEND bit ← 0(1) End TDRE = 1 ? Write transmit data to SSTDR register Data transmit continued? Read TEND bit in SSSR register TEND = 1 ? No Yes Yes No No Yes SSER register TE bit ← 0 (1) (2) (3) (1) After reading the SSSR register and confirming that the TDRE bit is set to 1, write the transmit data to the SSTDR register. When write the transmit data to the SSTDR register, the TDRE bit is automatically set to 0. (2) Determine whether data transmit is continued (3) When the data transmit is completed, the TEND bit is set to 1. Set the TEND bit to 0 and the TE bit to 0 and complete transmit mode. NOTE: 1. Write 0 after reading 1 to set the TEND bit to 0. |
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