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H8/3003 Datasheet(PDF) 445 Page - Renesas Technology Corp |
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H8/3003 Datasheet(HTML) 445 Page - Renesas Technology Corp |
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445 / 715 page  13.2 Register Descriptions 13.2.1 Receive Shift Register (RSR) RSR is the register that receives serial data. The SCI loads serial data input at the RxD pin into RSR in the order received, LSB (bit 0) first, thereby converting the data to parallel data. When 1 byte has been received, it is automatically transferred to RDR. The CPU cannot read or write RSR directly. 13.2.2 Receive Data Register (RDR) RDR is the register that stores received serial data. When the SCI finishes receiving 1 byte of serial data, it transfers the received data from RSR into RDR for storage. RSR is then ready to receive the next data. This double buffering allows data to be received continuously. RDR is a read-only register. Its contents cannot be modified by the CPU. RDR is initialized to H'00 by a reset and in standby mode. Bit Initial value Read/Write 7 — 6 — 5 — 4 — 3 — 0 — 2 — 1 — Bit Initial value Read/Write 7 0 R 6 0 R 5 0 R 4 0 R 3 0 R 0 0 R 2 0 R 1 0 R 427 |
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