AT89C1051 Ver la hoja de datos (PDF) - Atmel Corporation
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AT89C1051 Datasheet PDF : 12 Pages
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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. AT89C1051 SFR Map and Reset Values
0F8H
Restrictions on Certain Instructions
The AT89C1051 is an economical and cost-effective mem-
ber of Atmel’s growing family of microcontrollers. It con-
tains 1K byte of flash program memory. It is fully compati-
ble with the MCS-51 architecture, and can be programmed
using the MCS-51 instruction set. However, there are a
few considerations one must keep in mind when utilizing
certain instructions to program this device.
All the instructions related to jumping or branching should
be restricted such that the destination address falls within
the physical program memory space of the device, which is
1K for the AT89C1051. This should be the responsibility of
the software programmer. For example, LJMP 3FEH
would be a valid instruction for the AT89C1051 (with 1K of
memory), whereas LJMP 410H would not.
0FFH
0F0H
0E8H
B
00000000
0F7H
0EFH
0E0H
0D8H
ACC
00000000
0E7H
0DFH
0D0H
0C8H
PSW
00000000
0C0H
0D7H
0CFH
0C7H
0B8H
0B0H
0A8H
0A0H
IP
XXX00000
P3
11111111
IE
0XX00000
0BFH
0B7H
0AFH
0A7H
98H
9FH
90H
P1
11111111
88H TCON
TMOD
TL0
00000000 00000000 00000000
TH0
00000000
80H
SP
DPL
DPH
00000111 00000000 00000000
97H
8FH
PCON 87H
0XXX0000
4-6
AT89C1051
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