71M6521DE Datasheet, PDF (80/107 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/DH/FE Data Sheet
RTC_DEC_SEC
201C[1]
0 0 W RTC time correction bits. Only one bit may be pulsed at a time.
RTC_INC_SEC
201C[0]
00
When pulsed, causes the RTC time value to be incremented (or
decremented) by an additional second the next time the RTC_SEC
register is clocked. The pulse width may be any value. If an
additional correction is desired, the MPU must wait 2 seconds
before pulsing one of the bits again. Each write to one of these bits
must be preceded by a write to 201F (WE).
RTM_E
2002[3]
0 0 R/W Real Time Monitor enable. When ‘0’, the RTM output is low. This
bit enables the two wire version of RTM
RTM0[7:0]
2060
0 0 R/W Four RTM probes. Before each CE code pass, the values of these
RTM1[7:0]
2061
00
registers are serially output on the RTM pin. The RTM registers are
RTM2[7:0]
RTM3[7:0]
2062
2063
00
00
ignored when RTM_E=0.
SECURE
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/DH/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] 2001[5:0] 0 0 R/W The number of pre-summer outputs summed in the final summer.
TMUX[4:0]
20AA[4:0] 2 -- R/W Selects one of 32 signals for TMUXOUT.
[4:0] Selected Signal
[4:0] Selected Signal
0x00 DGND (analog)
0x01 Reserved
0x02 Reserved
0x03 Reserved
0x04 Reserved
0x05 Reserved
0x06 VBIAS (analog)
0x07 Not used
0x08 Reserved
0x09 Reserved
0x0A Reserved
0x0B Reserved
-0x13
0x14 RTM (Real time
0x15 WDTR_E, comparator 1
output from CE)
Output AND V1LT3)
0x16 – Not used
0x18 RXD, from optical in-
0x17
terface, after optional
inversion
0x19 MUX_SYNC
0x1A CK_10M
0x1B CK_MPU
0x1C Reserved
0x1D RTCLK_2P5
0x1E CE_BUSY
0x1F XFER_BUSY
TRIM[7:0]
20FF
Contains TRIMT[7:0], TRIMBGA,TRIMBGB or TRIMM[2:0] depending
0 0 R/W on the value written to TRIMSEL[3:0]. If TRIMBGB = 0, the device is
a 71M6521DE/FE, else it is a 71M6521DH.
Selects the temperature trim fuse to be read with the TRIM register:
TRIMSEL[3:0] Trim Fuse Purpose
TRIMSEL[3:0]
20FD[3:0] 0 0 R/W
1
TRIMT[7:0] Trim for the magnitude of
VREF
4
TRIMM[2:0] Trim values related to
5
TRIMBGA ^{temperature compensation}
6
TRIMBGB
Page: 80 of 107
Rev 2