參數(shù)資料
型號(hào)： SAB83C517A-5N18-T4
文件頁(yè)數(shù)： 27/77頁(yè)
文件大?。?/td> 1358K
代理商： SAB83C517A-5N18-T4
SAB 80C517A/83C517A-5
Semiconductor Group
26
1994-05-01
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
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
(WDTL)
3)
(WDTH)
3)
WDTREL
PCON
FF
H
07
H
00
H
00
H
(00
H
)
(00
H
)
00
H
00
H
98
H
99
H
9A
H
9B
H
9C
H
9D
H
9E
H
9F
H
S0CON
1)
S0BUF
IEN2
S1CON
S1BUF
S1RELL
reserved
reserved
00
H
XX
H
XX00 00X0
B
0X00 0000
B
XX
H
00
H
XX
H
XX
H
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
XX
H
2)
2)
A0
H
A1
H
A2
H
A3
H
A4
H
A5
H
A6
H
A7
H
P2
1)
COMSETL
COMSETH
COMCLRL
COMCLRH
SETMSK
CLRMSK
reserved
FF
H
00
H
00
H
00
H
00
H
00
H
00
H
XX
H
2
)
90
H
91
H
92
H
93
H
94
H
95
H
96
H
97
H
P1
1)
XPAGE
DPSEL
reserved
reserved
reserved
reserved
reserved
FF
H
00
H
XXXXX000B
XX
H
XX
H
XX
H
XX
H
XX
H
2
)
2)
2)
2)
2)
A8
H
A9
H
AA
H
AB
H
AC
H
AD
H
AE
H
AF
H
IEN0
1)
IP0
S0RELL
reserved
reserved
reserved
reserved
reserved
00
H
00
H
D9
H
XX
H
XX
H
XX
H
XX
H
XX
H
2
)
2
)
2
)
2
)
2
)
1)
Bit-addressable special function registers
2)
X means that the value is indeterminate and the location is reserved
3)
( )... SFRs not user accessable
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