SH7020 Datasheet, PDF (131/509 Pages) Renesas Technology Corp – SuperH™ RISC engine

Bit: 15
14
13
12
11
10
9
8
Bit name: PEF PFRC PEO PCHK1 PCHK0 —
—
—
Initial value: 0
0
0
0
0
0
0
0
R/W: R/W R/W R/W R/W R/W
—
—
—
Bit: 7
6
5
4
3
2
1
0
Bit name: —
—
—
—
—
—
—
—
Initial value: 0
0
0
0
0
0
0
0
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
0
1
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
0
1
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
0
1
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.
RENESAS 113