71M6541D Datasheet, PDF (105/166 Pages) Maxim Integrated Products – 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs

71M6541D/F/G and 71M6542F/G Data Sheet
5 Firmware Interface
5.1 I/O RAM Map –Functional Order
In Table 74 and Table 75, unimplemented (U) and reserved (R) bits are shaded in light gray. Unimplemented bits are identified with a ‘U’.
Unimplemented bits have no memory storage, writing them has no effect, and reading them always returns zero. Reserved bits are identified with
an ‘R’, and must always be written with a zero. Writing values other than zero to reserved bits may have undesirable side effects and must be
avoided. Non-volatile bits are shaded in dark gray. Non-volatile bits are backed-up during power failures if the system includes a battery connected
to the VBAT pin.
The I/O RAM locations listed in Table 74 have sequential addresses to facilitate reading by the MPU (e.g., in order to verify their contents). These
I/O RAM locations are usually modified only at boot-up. The addresses shown in Table 74 are an alternative sequential address to the addresses
from Table 75 which are used throughout document. For instance, EQU[2:0] can be accessed at I/O RAM 0x2000[7:5] or at I/O RAM 0x2106[7:5].
Name
CE6
CE5
CE4
CE3
CE2
CE1
CE0
RCE0
RTMUX
Reserved
MUX5
MUX4
MUX3
MUX2
MUX1
MUX0
TEMP
LCD0
LCD1
LCD2
LCD_MAP6
Addr
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
200A
200B
200C
200D
200E
200F
2010
2011
2012
2013
2014
Table 74: I/O RAM Map – Functional Order, Basic Configuration
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
EQU[2:0]
U
CHOP_E[1:0]
RTM_E
CE_E
U
SUM_SAMPS[12:8]
SUM_SAMPS[7:0]
U
U
CE_LCTN[5:0]
PLS_MAXWIDTH[7:0]
PLS_INTERVAL[7:0]
R
R
DIFFB_E
DIFFA_E RFLY_DIS
FIR_LEN[1:0]
PLS_INV
CHOPR[1:0]
R
R
RMT_E
R
R
R
U
TMUXRB[2:0]
U
TMUXRA[2:0]
U
U
R
U
U
U
U
U
MUX_DIV[3:0]
MUX10_SEL
MUX9_SEL
MUX8_SEL
MUX7_SEL
MUX6_SEL
MUX5_SEL
MUX4_SEL
MUX3_SEL
MUX2_SEL
MUX1_SEL
MUX0_SEL
TEMP_BSEL TEMP_PWR OSC_COMP TEMP_BAT TBYTE_BUSY
TEMP_PER[2:0]
LCD_E
LCD_MODE[2:0]
LCD_ALLCOM LCD_Y
LCD_CLK[1:0]
LCD_VMODE[1:0]
LCD_BLNKMAP23[5:0]
LCD_BAT
R
LCD_BLNKMAP22[5:0]
LCD_MAP[55:48]