71m6511h-igtr Maxim Integrated Products, Inc., 71m6511h-igtr Datasheet - Page 17

• Manufacturer Part Number: 71m6511h-igtr
• Description: Single-phase Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

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 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 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: 17 of 95
Hex\Bin
D8
D0
C8
C0
B8
B0
A8
A0
F8
F0
E8
E0
98
90
88
80
Bit-address-
INTBITS
WDCON
S0CON
IRCON
TCON
X000
PSW
IEN1
IEN0
able
WDI
P2
P1
P0
B
A
0xFF
0x80
0x7F
0x30
0x2F
0x20
0x1F
0x00
Address
S0BUF
TMOD
X001
DIR2
DIR1
IP1
IP0
SP
Special Function Registers
Table 7: Special Function Registers Locations
© 2005-2007 TERIDIAN Semiconductor Corporation
FLSHCTL
S0RELH
S0RELL
Direct addressing
X010
DIR0
IEN2
DPS
DPL
TL0
Table 6: Internal Data Memory Map
(SFRs)
S1RELH
S1CON
X011
DPH
TL1
Register banks R0…R7
Byte-addressable area
Byte-addressable
Bit-addressable area
ERASE
S1BUF
DPL1
X100
TH0
Single-Phase Energy Meter IC
Indirect addressing
S1RELL
DPH1
X101
TH1
71M6511/71M6511H
RAM
DATA SHEET
WDTREL
EEDATA
CKCON
X110
EECTRL
PGADR
PCON
USR2
X111
Bin/Hex
AUGUST 2007
EF
DF
D7
CF
C7
BF
B7
AF
A7
FF
F7
E7
9F
97
8F
87
V2.6