H838532H datasheet(310/508 Pages) RENESAS

310 / 508 page

Section 10 Serial Communication Interface

Rev. 1.00 May 30, 2008 Page 290 of 484

REJ09B0436-0100

10.2.3

Transmit Shift Register (TSR)

Bit

Read/Write

—

TSR is a register used to transmit serial data. Transmit data is first transferred from TDR to TSR,

and serial data transmission is carried out by sending the data to the TXD

3x pin in order, starting

from the LSB (bit 0). When one byte of data is transmitted, the next byte of transmit data is

transferred to TDR, and transmission started, automatically. Data transfer from TDR to TSR is not

performed if no data has been written to TDR (if bit TDRE is set to 1 in the serial status register

(SSR)).

TSR cannot be read or written directly by the CPU.

10.2.4

Transmit Data Register (TDR)

Bit

Initial value

Read/Write

TDR7

R/W

TDR6

R/W

TDR5

R/W

TDR4

R/W

TDR3

R/W

TDR0

R/W

TDR2

R/W

TDR1

R/W

TDR is an 8-bit register that stores transmit data. When TSR is found to be empty, the transmit

data written in TDR is transferred to TSR, and serial data transmission is started. Continuous

transmission is possible by writing the next transmit data to TDR during TSR serial data

transmission.

TDR can be read or written by the CPU at any time.

TDR is initialized to H'FF upon reset, and in standby, module standby, or watch mode.

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