H8S2245 datasheet(450/818 Pages) RENESAS

No. de pieza	H8S2245

Descripción Electrónicos	Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series

PDF	818 Pages

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Fabricante Electrónico	RENESAS [Renesas Technology Corp]

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450 / 818 page

Section 12 Serial Communication Interface (SCI)

Rev.3.00 Mar. 26, 2007 Page 408 of 772

REJ09B0355-0300

12.2

12.2.1

Receive Shift Register (RSR)

—

Bit

R/W

RSR is a register used to receive serial data.

The SCI sets serial data input from the RxD pin in RSR in the order received, starting with the

LSB (bit 0), and converts it to parallel data. When one byte of data has been received, it is

transferred to RDR automatically.

RSR cannot be directly read or written to by the CPU.

12.2.2

Receive Data Register (RDR)

Bit

Initial value

R/W

RDR is a register that stores received serial data.

When the SCI has received one byte of serial data, it transfers the received serial data from RSR to

RDR where it is stored, and completes the receive operation. After this, RSR is receive-enabled.

Since RSR and RDR function as a double buffer in this way, enables continuous receive

operations to be performed.

RDR is a read-only register, and cannot be written to by the CPU.

RDR is initialized to H'00 by a reset, and in standby mode or module stop mode.

H8S2245 Datasheet(PDF) 450 Page - Renesas Technology Corp