71M6521DE Datasheet, PDF (81/107 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/DH/FE Data Sheet
VERSION[7:0]
VREF_CAL
VREF_DIS
WAKE_ARM
WAKE_PRD
WAKE_RES
2006
-- --
R The version index. This word may be read by firmware to determine
the silicon version.
VERSION[7:0] Silicon Version
0000 0110
A06
2004[7]
0 0 R/W Brings VREF to VREF pad. This feature is disabled when
VREF_DIS=1.
2004[3]
0 1 R/W Disables the internal voltage reference.
20A9[7]
0 -- W Arm the autowake timer. Writing a 1 to this bit arms the autowake
timer and presets it with the values presently in WAKE_PRD and
WAKE_RES. The autowake timer is reset and disarmed whenever
the MPU is in MISSION mode or BROWNOUT mode. The timer
must be armed at least three RTC cycles before the SLEEP or LCD-
ONLY mode is commanded.
20A9[2:0] 001 -- R/W Sleep time. Time=WAKE_PRD[2:0]*WAKE_RES. Default=001.
Maximum value is 7.
20A9[3]
0 -- R/W Resolution of WAKE timer: 1 – 1 minute, 0 – 2.5 seconds.
WD_RST
WD_OVF
WE
SFRE8[7] 0 0 W WD timer bit: Possible operations to this bit are:
Read: Gets the status of the flag IE_PLLFALL
Write 0: Clears the flag
Write 1:.Resets the WDT
2002[2]
0 0 R/W The WD overflow status bit. This bit is set when the WD timer
overflows. It is powered by the non-volatile supply and at bootup
will indicate if the part is recovering from a WD overflow or a power
fault. This bit should be cleared by the MPU on bootup. It is also
automatically cleared when RESET is high.
201F7:0] -- -- W Write operations on the RTC registers must be preceded by a write
operation to WE.
Rev 2
Page: 81 of 107