UPD30181 Datasheet, PDF (116/444 Pages) NEC – 64-/32-Bit Microprocessor

CHAPTER 6 BUS CONTROL
6.2.5 REVIDREG (0x0A00 0014)
Bit
Name
R/W
15
RID3
R
14
RID2
R
13
RID1
R
12
RID0
R
11
MJREV3
R
10
MJREV2
R
9
MJREV1
R
8
MJREV0
R
Bit
Name
R/W
7
Reserved
R
6
Reserved
R
5
Reserved
R
4
Reserved
R
3
MNREV3
R
2
MNREV2
R
1
MNREV1
R
0
MNREV0
R
Bit
15 to 12
11 to 8
7 to 4
3 to 0
Name
RID(3:0)
MJREV(3:0)
Reserved
MNREV(3:0)
Function
Processor revision ID (Read Only)
Major revision ID number (Read only)
0 is returned when read
Minor revision ID (Read only)
This register is used to indicate the revision of the VR4181. The relationship between the values and the revision
of the VR4181 is as follows.
VR4181 Revision
1.0
1.1
1.2
1.3
RID(3:0)
0x0
0x0
0x0
0x0
MJREV(3:0)
0x0
0x0
0x0
0x0
MINREV(3:0)
0x0
0x1
0x2
0x2
Even if the CPU core or the peripheral unit has been changed, there is no guarantee that REVIDREG register will
be reflected, or that the changes to the revision number necessarily reflect real changes of the CPU core or the
peripheral unit. For this reason, software should not rely on the revision number in REVIDREG register to
characterize the units.
Caution Values of this register bits differ depending on the delivery date.
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User’s Manual U14272EJ3V0UM