Siemens SAB 80515 Series, User Manual, Page: 230 / 270

Device Specifications
Semiconductor Group 230
Special Function Registers
All registers, except the program counter and the four general purpose register banks, reside
in the special function register area. The 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 3 they are organized
in groups which refer to the functional blocks of the SAB 80C515.
Table 1: Special Function Register
Address Register Contents
after Reset Address Register Contents
after Reset
80
H
81
H
82
H
83
H
84
H
85
H
86
H
87
H
P0 1)
SP
DPL
DPH
reserved
reserved
reserved
PCON
0FF
H
07
H
00
H
00
H
XX
H
2)
XX
H
2)
XX
H
2)
000X 0000
B
2)
98
H
99
H
9A
H
9B
H
9C
H
9D
H
9E
H
9F
H
SCON 1)
SBUF
reserved
reserved
reserved
reserved
reserved
reserved
00
H
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
88
H
89
H
8A
H
8B
H
8C
H
8D
H
8E
H
8F
H
TCON 1)
TMOD
TL0
TL1
TH0
TH1
reserved
reserved
00
H
00
H
00
H
00
H
00
H
00
H
XX
H
2)
XX
H
2)
A0
H
A1
H
A2
H
A3
H
A4
H
A5
H
A6
H
A7
H
P2 1)
reserved
reserved
reserved
reserved
reserved
reserved
reserved
0FF
H
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
90
H
91
H
92
H
93
H
94
H
95
H
96
H
97
H
P1 1)
reserved
reserved
reserved
reserved
reserved
reserved
reserved
0FF
H
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
A8
H
A9
H
AA
H
AB
H
AC
H
AD
H
AE
H
AF
H
IEN0 1)
IP0
reserved
reserved
reserved
reserved
reserved
reserved
00
H
X000 0000
B
2
)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
XX
H
2)
1)
Bit-addressable Special Function Register
2)
X means that the value is indeterminate and the location is reserved
*