H8SLASH3021 datasheet(370/712 Pages) RENESAS

370 / 712 page

11. Serial Communication Interface

Rev.2.00 Mar. 22, 2007 Page 346 of 684

REJ09B0352-0200

11.2.7

Serial Status Register (SSR)

SSR is an 8-bit register containing multiprocessor bit values, and status flags that indicate the SCI

operating status.

Bit

Initial value

Read/Write

Note: * Only 0 can be written to clear the flag.

TDRE

R/(W)

RDRF

R/(W)

ORER

R/(W)

FER

R/(W)

PER

R/(W)

MPBT

R/W

TEND

MPB

Transmit data register empty

Status flag indicating that transmit data has been transferred from TDR into

TSR and new data can be written in TDR

Multiprocessor

bit transfer

Value of multi-

processor bit to

be transmitted

Receive data register full

Status flag indicating that data has been received and stored in RDR

Overrun error

Status flag indicating detection of a receive overrun error

Framing error

Status flag indicating detection of a receive

framing error

Parity error

Status flag indicating detection of

a receive parity error

Transmit end

Status flag indicating end of

transmission

Multiprocessor bit

Stores the received

multiprocessor bit value

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