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AT89C1051U-12SI Datasheet(PDF) 4 Page - ATMEL Corporation

Part # AT89C1051U-12SI
Description  8-Bit Microcontroller with 1K Bytes Flash
Download  14 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C1051U-12SI Datasheet(HTML) 4 Page - ATMEL Corporation

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AT89C1051U
4
Special Function Registers
A map of the on-chip memory area called the Special Func-
tion Register (SFR) space is shown in the table below.
Note that not all of the addresses are occupied, and unoc-
cupied addresses may not be implemented on the chip.
Read accesses to these addresses will in general return
random data, and write accesses will have an indetermi-
nate effect.
User software should not write 1s to these unlisted loca-
tions, since they may be used in future products to invoke
new features. In that case, the reset or inactive values of
the new bits will always be 0.
Table 1. AT89C1051U SFR Map and Reset Values
0F8H
0FFH
0F0H
B
00000000
0F7H
0E8H
0EFH
0E0H
ACC
00000000
0E7H
0D8H
0DFH
0D0H
PSW
00000000
0D7H
0C8H
0CFH
0C0H
0C7H
0B8H
IP
XXX00000
0BFH
0B0H
P3
11111111
0B7H
0A8H
IE
0XX00000
0AFH
0A0H
0A7H
98H
SCON
00000000
SBUF
XXXXXXXX
9FH
90H
P1
11111111
97H
88H
TCON
00000000
TMOD
00000000
TL0
00000000
TL1
00000000
TH0
00000000
TH1
00000000
8FH
80H
SP
00000111
DPL
00000000
DPH
00000000
PCON
0XXX0000
87H


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