SAB80C517A-N18 Siemens Semiconductor Group, SAB80C517A-N18 Datasheet - Page 27

• Manufacturer Part Number: SAB80C517A-N18
• Description: 8-Bit CMOS Single-Chip Microcontroller
• Manufacturer: Siemens Semiconductor Group

Special Function Registers
All registers, except the program counter and the four general purpose register banks, reside
in the special function register area. The 81 special function registers include arithmetic
registers, pointers, and registers that provide an interface between the CPU and the on-chip
peripherals. There are also 128 directly addressable bits within the SFR area. All special
function registers are listed in table 1 and table 2.
In table 1 they are organized in numeric order of their addresses. In table 2 they are organized
in groups which refer to the functional blocks of the SAB 80C517A.
Table 2
Special Function Register
Address
80
81
82
83
84
85
86
87
88
89
8A
8B
8C
8D
8E
8F
90
91
92
93
94
95
96
97
1)
2)
3)
Semiconductor Group
Bit-addressable special function registers
X means that the value is indeterminate and the location is reserved
( )... SFRs not user accessable
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
Register
P0
SP
DPL
DPH
(WDTL)
(WDTH)
WDTREL
PCON
TCON
TMOD
TL0
TL1
TH0
TH1
reserved
reserved
P1
XPAGE
DPSEL
reserved
reserved
reserved
reserved
reserved
1)
1)
1)
3)
3)
Contents
after Reset
FF
07
00
00
(00
(00
00
00
00
00
00
00
00
00
XX
XX
FF
00
XXXXX000 B
XX
XX
XX
XX
XX
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
)
)
2
2)
2)
2)
2)
2)
2)
)
26
Address
98
99
9A
9B
9C
9D
9E
9F
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
AA
AB
AC
AD
AE
AF
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
SAB 80C517A/83C517A-5
Register
S0CON
S0BUF
IEN2
S1CON
S1BUF
S1RELL
reserved
reserved
P2
COMSETL
COMSETH
COMCLRL
COMCLRH
SETMSK
CLRMSK
reserved
IEN0
IP0
S0RELL
reserved
reserved
reserved
reserved
reserved
1)
1)
1)
Contents
after Reset
00
XX
XX00 00X0
0X00 0000
XX
00
XX
XX
FF
00
00
00
00
00
00
XX
00
00
D9
XX
XX
XX
XX
XX
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
2
2
2
2
2
2
)
)
)
)
1994-05-01
)
)
B
B