71M6533 Datasheet, PDF (94/132 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6533/G/H and 71M6534/H Data Sheet
VERSION[7:0]
2006
20C8
–
–
–
–
VREF_CAL
VREF_DIS
WAKE_ARM
2004[7]
2004[3]
20A9[7]
0
0
0
0
0
–
WAKE_PRD
WAKE_RES
WD_NROVF_
FLAG
20A9[2:0]
20A9[3]
20B1[0]
001
–
0
–
–
0
WD_RST
SFR F8[7]
0
0
WD_OVF
2002[2]
0 NV*
WE
201F[7:0]
WRPROT_BT
SFR B2[5]
0
0
WRPROT_CE SFR B2[4]
0
0
† _{Applicable to the 71M6534 only.}
FDS_6533_6534_004
The device version index. This word may be read by the firmware to determine the
R ^{silicon version.}
R
VERSION[7:0] Silicon Version
0000 0101 A05
R/W Brings VREF to the VREF pad. This feature is disabled when VREF_DIS =1.
R/W Disables the internal voltage reference.
Writing a 1 to this bit arms the autowake timer and presets it with the values presently
W
in WAKE_PRD and WAKE_RES. The autowake timer is reset and disarmed whenever
the processor 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.
R/W
Sleep time. Time = WAKE_PRD[2:0]*WAKE_RES. The default = 001. The maximum
value is 7.
R/W Resolution of WAKE timer: 1 = 1 minute, 0 = 2.5 seconds.
R/W
This flag is set approximately 1 ms before the watchdog timer overflows. It is cleared
by writing a 0 or on the falling edge of WAKE.
WD timer bit. This bit must be accessed with byte operations. Operations possible for
W
this bit are:
Write 0: Clears the flag.
Write 1: Resets the WDT.
The WDT overflow status bit, set when the WDT overflows. It is preserved in LCD
mode and will indicate at bootup if the part is recovering from a WDT overflow or a
R/W power fault. This bit should be cleared by the MPU on bootup. It is also automatically
cleared when RESET is high.
*Not preserved in SLEEP mode
W An 8-bit value has to be written to this address prior to accessing the RTC registers.
When set, this bit protects flash addresses from 0 to BOOT_SIZE*1024 from flash page erase.
When set, this bit protects flash addresses from CE_LCTN*1024 to the end of memory
from flash page erase.
94
Rev 2