71M6521DE/71M6521FE
Energy Meter IC
DATASHEET
JANUARY 2008
RTM0[7:0]
RTM1[7:0]
RTM2[7:0]
RTM3[7:0]
SECURE
2060
2061
2062
2063
0
0
0
0
0
0
0
0
R/W Four RTM probes. Before each CE code pass, the values of these
registers are serially output on the RTM pin. The RTM registers are
ignored when RTM_E=0.
SFRB2[6]
0
--
R/W Enables security provisions that prevent external reading of flash
memory and CE program RAM. This bit is reset on chip reset and
may only be set. Attempts to write zero are ignored.
SLEEP
20A9[6]
0
0
W
Takes the 6521DE/FE to sleep mode. Ignored if system power is
present. The part will wake when the autowake timer times out,
when push button is pushed, or when system power returns.
SUM_CYCLES[5:0]
TMUX[4:0]
2001[5:0]
20AA[4:0]
0
2
0
--
R/W The number of pre-summer outputs summed in the final summer.
R/W Selects one of 32 signals for TMUXOUT.
[4:0]
Selected Signal
DGND (analog)
Reserved
Reserved
VBIAS (analog)
Reserved
[4:0]
Selected Signal
Reserved
Reserved
Reserved
Not used
0x00
0x02
0x04
0x06
0x08
0x0A
0x01
0x03
0x05
0x07
0x09
0x0B
-0x13
0x15
Reserved
Reserved
Reserved
0x14
RTM (Real time
output from CE)
WDTR_E, comparator 1
Output AND V1LT3)
RXD, from optical in-
terface, after optional
inversion
0x16 – Not used
0x17
0x18
0x19
0x1B
0x1D
0x1F
MUX_SYNC
CK_MPU
RTCLK_2P5
XFER_BUSY
0x1A
0x1C
0x1E
CK_10M
Reserved
CE_BUSY
VERSION[7:0]
VREF_CAL
2006
--
0
--
0
R
The version index. This word may be read by firmware to determine
the silicon version.
VERSION[7:0]
0000 0110
Silicon Version
A06
2004[7]
R/W Brings VREF to VREF pad. This feature is disabled when
VREF_DIS=1.
VREF_DIS
WAKE_ARM
2004[3]
20A9[7]
0
0
1
--
R/W Disables the internal voltage reference.
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.
WAKE_PRD
WAKE_RES
20A9[2:0]
20A9[3]
001
0
--
--
R/W Sleep time. Time=WAKE_PRD[2:0]*WAKE_RES. Default=001.
Maximum value is 7.
R/W Resolution of WAKE timer: 1 – 1 minute, 0 – 2.5 seconds.
v1.0
© 2005-2008 TERIDIAN Semiconductor Corporation
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