71M6521FE-IMR/F Maxim Integrated Products, 71M6521FE-IMR/F Datasheet - Page 19

• Manufacturer Part Number: 71M6521FE-IMR/F
• Description: IC ENERGY METER 32K FLASH 68-QFN
• Manufacturer: Maxim Integrated Products

Specifications of 71M6521FE-IMR/F

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

71M6521DE/DH/FE Data Sheet
Internal Data Memory: 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 6 shows the internal data
memory map.
Special Function Registers (SFRs)
A map of the Special Function Registers is shown in Table 7.
Only a few addresses are occupied, the others are not implemented. SFRs specific to the 652X 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.
Rev 2
Hex\Bin
E8
E0
D8
D0
C8
C0
B8
B0
A8
A0
F8
F0
98
90
88
80
Bit-address-
INTBITS
WDCON
T2CON
IRCON
S0CON
TCON
X000
IEN1
IEN0
able
WDI
PSW
P2
P1
P0
B
A
Address
0xFF
0x80
0x7F
0x30
0x2F
0x20
0x1F
0x00
S0BUF
TMOD
X001
DIR2
DIR1
IP1
IP0
SP
Special Function Registers
(SFRs)
Table 7: Special Function Registers Locations
Direct addressing
IEN2
FLSHCTL
Table 6: Internal Data Memory Map
S0RELH
S0RELL
X010
DIR0
DPL
DPS
TL0
Register banks R0…R7
S1RELH
S1CON
Byte-addressable area
X011
Bit-addressable area
DPH
TL1
Byte-addressable
ERASE
S1BUF
X100
DPL1
TH0
Indirect addressing
S1RELL
DPH1
X101
TH1
RAM
EEDATA
WDTREL
CKCON
X110
EECTRL
PGADR
PCON
X111
USR2
Bin/Hex
Page: 19 of 107
DF
CF
BF
AF
FF
F7
EF
E7
D7
C7
B7
A7
9F
8F
97
87