SH7021 datasheet(131/509 Pages) RENESAS

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RENESAS 113

Bit:

Bit name:

PEF

PFRC

PEO

PCHK1

PCHK0

—

Initial value:

R/W:

R/W

—

Bit:

Bit name:

—

Initial value:

R/W:

—

•

Bit 15 (parity error flag (PEF)): When a parity check is done, PEF indicates whether a parity

error has occurred. 0 indicates that no parity error has occurred; 1 indicates that a parity error

has occurred.

Bit 15: PEF

Description

No parity error (initial value).

Cleared by reading PEF after it has been set to 1, then writing 0 in

PEF.

Parity error has occurred.

•

Bit 14 (parity output force (PFRC)): PFRC selects whether to produce a forced parity output

for testing the parity error check function. When cleared to 0, there is no forced output; when

set to 1, it produces a forced output of high level from the DPH and DPL pins when data is

output, regardless of the parity.

Bit 14: PFRC

Description

Parity output not forced (initial value)

High output forced

•

Bit 13 (parity polarity (PEO)): PEO selects even or odd parity. When cleared to 0, parity is

even; when set to 1, parity is odd.

Bit 13: PEO

Description

Even parity (initial value)

Odd parity

•

Bits 12 and 11 (parity check enable bits 1, 0 (PCHK1 and PCHK0)): These bits determine

whether or not a parity is checked and generated, and select the check and generation spaces.

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