71M6521DE Datasheet, PDF (79/107 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/DH/FE Data Sheet
MUX_DIV[1:0]
2002[7:6]
0 0 R/W The number of states in the input multiplexer.
OPT_FDC[1:0]
OPT_RXDIS
OPT_RXINV
OPT_TXE[1,0]
OPT_TXINV
OPT_TXMOD
PLL_OK
PLS_MAXWIDTH
[7:0]
PLS_INTERVAL
[7:0]
PLS_INV
PREBOOT
PRE_SAMPS[1:0]
RTC_SEC[5:0]
RTC_MIN[5:0]
RTC_HR[4:0]
RTC_DAY[2:0]
RTC_DATE[4:0]
RTC_MO[3:0]
RTC_YR[7:0]
2007[1:0]
2008[5]
2008[4]
2007[7,6]
2008[0]
2008[1]
2003[6]
2080[7:0]
2081[7:0]
2004[6]
SFRB2[7]
2001[7:6]
2015
2016
2017
2018
2019
201A
201B
00- illegal
01- 4 states 10-3 states 11-2 states
0 0 R/W Selects OPT_TX modulation duty cycle
OPT_FDC Function
00
50% Low
01
25% Low
10
12.5% Low
11
6.25% Low
0 0 R/W OPT_RX can be configured as an analog input to the optical UART
comparator or as a digital input/output, DIO1.
0—OPT_RX, 1—DIO1.
0 0 R/W Inverts result from OPT_RX comparator when 1. Affects only the
UART input. Has no effect when OPT_RX is used as a DIO input.
00 00 R/W Configures the OPT_TX output pin.
00—OPT_TX, 01—DIO2, 10—WPULSE, 11—VARPULSE
0 0 R/W Invert OPT_TX when 1. This inversion occurs before modulation.
0 0 R/W Enables modulation of OPT_TX. When OPT_TXMOD is set,
OPT_TX is modulated when it would otherwise have been zero.
The modulation is applied after any inversion caused by
OPT_TXINV.
00
R Indicates that system power is present and the clock generation PLL
is settled.
FF FF R/W Determines the maximum width of the pulse (low going pulse).
Maximum pulse width is (2*PLS_MAXWIDTH + 1)*T_I. Where T_I is
PLS_INTERVAL. If PLS_INTERVAL=0, T_I is the sample time
(397µs). If 255, disable MAXWIDTH.
0 0 R/W If the FIFO is used, PLS_INTERVAL must be set to 81. If
PLS_INTERVAL = 0, the FIFO is not used and pulses are output as
soon as the CE issues them.
0 0 R/W Inverts the polarity of WPULSE and VARPULSE. Normally, these
pulses are active low. When inverted, they become active high.
-- --
R Indicates that preboot sequence is active.
0
0
R/W
The duration of the pre-summer, in samples.
00-42, 01-50, 10-84, 11-100.
-- -- R/W The RTC interface. These are the ‘year’, ‘month’, ‘day’, ‘hour’,
-- -- R/W ‘minute’ and ‘second’ parameters of the RTC. The RTC is set by
-- -- R/W writing to these registers. Year 00 and all others divisible by 4 are
-- -- R/W defined as leap years.
-- -- R/W
SEC 00 to 59
-- -- R/W
MIN 00 to 59
-- -- R/W
HR 00 to 23 (00=Midnight)
DAY 01 to 07 (01=Sunday)
DATE 01 to 31
MO 01 to 12
YR 00 to 99
Each write to one of these registers must be preceded by a write to
201F (WE).
Rev 2
Page: 79 of 107