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SH7052 Datasheet(PDF) 470 Page - Renesas Technology Corp |
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SH7052 Datasheet(HTML) 470 Page - Renesas Technology Corp |
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470 / 919 page  444 14.2.2 Receive Data Register (RDR) The receive data register (RDR) stores serial receive data. The SCI completes the reception of one byte of serial data by moving the received data from the receive shift register (RSR) into RDR for storage. RSR is then ready to receive the next data. This double buffering allows the SCI to receive data continuously. The CPU can read but not write to RDR. RDR is initialized to H'00 by a power-on reset, and in hardware standby mode and software standby mode. It is not initialized by a manual reset. Bit: 7 6 5 4 3 2 1 0 Initial value: 0 0 0 0 0 0 0 0 R/W: R R R R R R R R 14.2.3 Transmit Shift Register (TSR) The transmit shift register (TSR) transmits serial data. The SCI loads transmit data from the transmit data register (TDR) into TSR, then transmits the data serially from the TxD pin, LSB (bit 0) first. After transmitting one data byte, the SCI automatically loads the next transmit data from TDR into TSR and starts transmitting again. If the TDRE bit of SSR is 1, however, the SCI does not load the TDR contents into TSR. The CPU cannot read or write to TSR directly. Bit: 7 6 5 4 3 2 1 0 R/W: — — — — — — — — |
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