71M6521BE Datasheet, PDF (18/97 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521BE
Energy Meter IC
DATA SHEET
JANUARY 2008
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 5 shows the internal data memory map.
Address
0xFF
0x80
0x7F
0x30
0x2F
0x20
0x1F
0x00
Direct addressing
Special Function Registers
(SFRs)
Indirect addressing
RAM
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.
Bit-address-
Hex\Bin
able
X000
F8
INTBITS
F0
B
E8
WDI
E0
A
D8
WDCON
D0
PSW
C8
T2CON
C0
IRCON
B8
IEN1
B0
A8
IEN0
A0
P2
98
S0CON
90
P1
88
TCON
80
P0
X001
IP1
IP0
DIR2
S0BUF
DIR1
TMOD
SP
X010
S0RELH
FLSHCTL
S0RELL
DIR0
IEN2
DPS
TL0
DPL
Byte-addressable
X011
X100
X101
S1RELH
S1CON
TL1
DPH
S1BUF
ERASE
TH0
DPL1
S1RELL
TH1
DPH1
X110
EEDATA
CKCON
WDTREL
X111
USR2
PGADR
EECTRL
PCON
Bin/Hex
FF
F7
EF
E7
DF
D7
CF
C7
BF
B7
AF
A7
9F
97
8F
87
Table 6: Special Function Registers Locations
Only a few addresses are occupied, the others are not implemented. SFRs specific to the 6521BE 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 97
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