71M6403-IGTR TERIDIAN [Teridian Semiconductor Corporation], 71M6403-IGTR Datasheet - Page 16

• Manufacturer Part Number: 71M6403-IGTR
• Description: Electronic Trip Unit
• Manufacturer: TERIDIAN [Teridian Semiconductor Corporation]

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 4 shows the internal data memory map.
Special Function Registers (SFRs)
A map of the Special Function Registers is shown in Table 5.
Only a few addresses are occupied, the others are not implemented. SFRs specific to the 71M6403 are shown in bold print. Any
read access to unimplemented addresses will return undefined data, while any write access will have no effect.
Page: 16 of 75
Hex\Bin
D8
D0
C8
C0
B8
B0
A8
A0
F8
F0
E8
E0
98
90
88
80
INTBITS
WDCON
S0CON
IRCON
TCON
X000
PSW
IEN1
IEN0
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 5: Special Function Registers Locations
FLSHCTL
Direct addressing
S0RELH
S0RELL
X010
DIR0
IEN2
DPS
DPL
TL0
Table 4: Internal Data Memory Map
(SFRs)
©
2006 TERIDIAN Semiconductor Corporation
S1RELH
S1CON
X011
DPH
TL1
Register banks R0…R7
Byte-addressable area
Bit-addressable area
ERASE
S1BUF
DPL1
X100
TH0
Indirect addressing
S1RELL
DPH1
X101
TH1
Electronic Trip Unit
RAM
EEDATA
WDTREL
CKCON
X110
EECTRL
PGADR
PCON
USR2
X111
71M6403
SEPTEMBER 2006
Bin/Hex
DF
CF
BF
AF
FF
F7
EF
E7
D7
C7
B7
A7
9F
8F
97
87
REV 1.0