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71M6533- DB Demo Board User’s Manual
MPU STATUS WORD
The MPU maintains the status of certain meter and I/O related variables in the Status Word. The Status Word is
Status
Word Bit
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Name
CREEP
MINVC
PB_PRESS
SPURIOUS
MINVB
MAXVA
MAXVB
MAXVC
MINVA
WD_DETECT
MAXIN
MAXIA
MAXIB
MAXIC
MINT
MAXT
BATTERY_BAD
CLOCK_TAMPER
CAL_BAD
CLOCK_UNSET
DESCRIPTION
Indicates that all elements are in creep mode. The CE’s pulse variables
will be “jammed” with a constant value on every accumulation interval to
prevent spurious pulses. Note that creep mode therefore halts pulsing
even when the CE’s pulse mode is “internal”.
Element C has a voltage below VThrshld. This forces that element into
creep mode.
A push button press was recorded at the most recent reset or wake from
a battery mode.
An unexpected interrupt was detected.
Element B has a voltage below VThrshld. This forces that element into
creep mode.
Element A has a voltage above VThrshldP.
Element B has a voltage above VThrshldP.
Element C has a voltage above VThrshldP.
Element A has a voltage below VThrshld. This forces that element into
creep mode. It also forces the frequency and main edge count to zero.
The most recent reset was a watchdog reset. This usually indicates a
software error.
The neutral current is over INThrshld. In a real meter this could indicate
faulty distribution or tampering.
The current of element A is over IThrshld. In a real meter this could
indicate overload.
The current of element B is over IThrshld. In a real meter this could
indicate overload.
The current of element C is over IThrshld. In a real meter this could
indicate overload.
The temperature is below the minimum, -40C, established in option_gbl.h.
This is not very accurate in the demo code, because the calibration
temperature is usually poorly controlled, and the default temp_nom is
usually many degrees off. – 40C is the minimum recommended operating
temperature of the chip.
The temperature is above the maximum, 85C, established in option_gbl.h.
This is not very accurate in the demo code, because the calibration
temperature is usually poorly controlled, and the default temp_nom is
usually many degrees off. 85C is the maximum recommended operating
temperature of the chip.
Just after midnight, the demo code sets this bit if VBat < VBatMin. The
read is infrequent to reduce battery loading to very low values. When the
battery voltage is being displayed, the read occurs every second, for up to
20 seconds.
Clock set to a new value more than two hours from the previous value.
Set after reset when the read of the calibration data has a bad longitudinal
redundancy check or read failure.
Set when the clock’s current reading is A) More than a year after the
previously saved reading, or B) Earlier than the previously saved reading,
or C) There is no previously saved reading.
Page: 31 of 75
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