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R01UH0336EJ0102 Rev.1.02
Page 322 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 9 Safety Functions
Majority method
When writing to the address of a register having the majority structure, the
same value is written to three majority registers. When reading, the value read
is that for which at least two of the three registers have the same value. If the
value in a register is inverted due to a malfunction, reading from the
corresponding address corrects it.
(3)
BSEQ0CTLx – Self-Diagnostic BIST Control Register x (x = A / B / C)
These registers are the individual registers used in majority decisions for the
BSEQ0CTL register. The values held by the individual registers before the
majority decision can be checked by reading registers A, B and C. The
registers are initialized when the power supply is turned on or the power supply
voltage for the internal regulator (VDD) falls below the detection voltage
indicated for the POF.
Access
This register can be read/written in 8-bit units.
Address
BSEQ0CTLA: FF42 0044
H
BSEQ0CTLB: FF42 0048
H
BSEQ0CTLC: FF42 004C
H
Initial value
01
H
Caution
After executing the instruction to write to this register, the completion of actual
writing takes time. For details, see Section 9.5.2, (2), BSEQ0CTL - Self-
Diagnostic BIST Control Register.
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
HWBISTEN
R
R
R
R
R
R
R
R/W
Table 9-12
Contents of the BSEQ0CTLx Register
Bit Position
Bit Name
Function
0
HWBISTEN
This bit specifies execution or skipping of self-diagnostic BIST.
0: Self-Diagnostic BIST is skipped.
1: Self-Diagnostic BIST is executed.