Intel MCS 51 User Manual

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8XC51FX HARDWARE DESCRIPTION
User software should not write 1s to these unimple-
Thefhnctionsof the SFRS are outlined below. More
mented locations, sinoe they may be used in future
information on the use of specific SFRSfor each periph-
MCS-51 products to invoke new features In that ease
eral is included in the description of that peripheral.
the reset or inactive values of the new bits will always
be O,and their active values will be 1. Accumdaton ACC is the Accumulator register. The
F8
FO
E8
EO
Da
Do
C8
co
B8
BO
A8
AO
98
90
88
80
*=
uMor-Speoitic instructions,mnemonies for Aecurn
however, refer to the Accumulator simply as A.
Table2.SFRMappingand ReaetValuea
CH CCAPOH CCAPIH CCAP2H
CCAP3H
CCAP4H
FF
00000000 Xxxxxxxx Xxxxxxx Xxxxxxxx XxxxMxx
Xxxxxxx
“B
F7
00000000
CL CCAPOL CCAP1L
CCAP2L CCAP3L
CCAP4L EF
00000000 )waxxxx XxxxXXX
XmxxxXX Xxxxxxxx
Xxxxxxxx
* ACC E7
00000000
CCON CMOD CCAPMO CCAPM1 CCAPM2 CCAPM3
CCAPM4 DF
Ooxooooo
Ooxxxooo Xooooooo Xooooooo Xooooooo Xooooooo
Xooooooo
* Psw
D7
00000000
T2CON
T2MOD RCAP2L
RCAP2H T12 TH2 CF
00000000Xxxxxxoo 00000000 00000000 00000000 00000000
C7
* 1P SADEN BF
Xooooooo
00000000
* P3
IPH B7
11111111
Xooooooo
* IE SADDR
AF
00000000
00000000
“ P2 A7
11111111
“ SCON
* SBUF 9F
Oooooooa
XxxxXxX
* P1
97
11111111
* TCON
* TMOD * TLO * TL1 * THO
● TH1 8F
00000000
00000000 00000000 00000000 00000000 00000000
* Po
● SP “ DPL * DPH
“ PCQN
●* 87
11111111
00000111 00000000 00000000 Ooxxoooo
Foundinthe8051core(see8051HardwareDasoriotionforexplanationsoftheseSFRS).
“* = SeedescriptionofPCONSFR.BitPCON.4isnotaffectedbyreset.
..
X = Llndafinad.
5-5

Intel MCS 51 Specifications

General

Brand	Intel
Model	MCS 51
Category	Microcontrollers
Language	English