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71M6513/71M6513H
A Maxim Integrated Products Brand
3 -Phase Energy Meter IC
DATA SHEET
AUGUST 2011
Internal Data Memory: The Internal data memory provides 256 bytes (0x00 to 0xFF) of data memory. The internal data
memory address is always 1 byte wide and can be accessed by either direct or indirect addressing. The Special Function
Registers occupy the upper 128 bytes . This SFR area is available only by direct addressing. Indirect addressing
accesses the upper 128 bytes of Internal RAM.
The lower 128 bytes contain working registers and bit-addressable memory. The lower 32 bytes form four banks of eight
registers (R0-R7). Two bits on the program memory status word (PSW) select which bank is in use. The next 16 bytes form a
block of bit-addressable memory space at bit addressees 0x00-0x7F. All of the bytes in the lower 128 bytes are accessible
through direct or indirect addressing. Table 5 shows the internal data memory map.
Address
0xFF
0x80
Direct addressing
Special Function Registers
(SFRs)
Indirect addressing
RAM
0x7F
0x30
0x2F
0x20
0x1F
0x00
Byte-addressable area
Bit-addressable area
Register banks R0…R7
Table 5: Internal Data Memory Map
Special Function Registers (SFRs)
A map of the Special Function Registers is shown in Table 6.
Hex\Bin
Bit-address-
able
Byte-addressable
Bin/Hex
X000
X001
X010
X011
X100
X101
X110
X111
F8
F0
E8
E0
D8
D0
C8
C0
INTBITS
B
WDI
A
WDCON
PSW
IRCON
FF
F7
EF
E7
DF
D7
CF
C7
B8
IEN1
IP1
S0RELH
S1RELH
USR2
BF
B0
FLSHCTL
PGADR
B7
A8
A0
IEN0
P2
IP0
DIR2
S0RELL
DIR0
AF
A7
98
S0CON
S0BUF
IEN2
S1CON
S1BUF
S1RELL
EEDATA
EECTRL
9F
90
P1
DIR1
DPS
ERASE
97
88
TCON
TMOD
TL0
TL1
TH0
TH1
CKCON
8F
80
P0
SP
DPL
DPH
DPL1
DPH1
WDTREL
PCON
87
Table 6: Special Function Registers Locations
Only a few addresses are occupied, the others are not implemented. SFRs specific to the 651X are shown in bold print. Any
read access to unimplemented addresses will return undefined data, while any write access will have no effect. The registers
at 0x80, 0x88, 0x90, etc., are bit-addressable, all others are byte-addressable.
Page: 18 of 104
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