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P89C51 View Datasheet(PDF) - Philips Electronics

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Description
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P89C51 Datasheet PDF : 39 Pages
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Philips Semiconductors
80C51 8-bit microcontroller family
4K/8K/16K/32K Flash
Product data
89C51/89C52/89C54/89C58
Table 1. 89C51/89C52/89C54/89C58 Special Function Registers
SYMBOL
DESCRIPTION
DIRECT
BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION
RESET
ADDRESS MSB
LSB VALUE
ACC*
Accumulator
E0H
E7
E6
E5
E4
E3
E2
E1
E0 00H
AUXR# Auxiliary
8EH
AO xxxxxxx0B
AUXR1# Auxiliary 1
A2H
GF2
0
DPS xxxx00x0B
B*
B register
F0H
F7
F6
F5
F4
F3
F2
F1
F0 00H
DPTR:
Data Pointer (2 bytes)
DPH
Data Pointer High
83H
00H
DPL
Data Pointer Low
82H
00H
AF
AE
AD
AC
AB
AA
A9
A8
IE*
Interrupt Enable
A8H
EA
ET2
ES
ET1 EX1 ET0 EX0 0x000000B
BF
BE
BD
BC
BB
BA
B9
B8
IP*
Interrupt Priority
B8H
PT2
PS
PT1 PX1 PT0 PX0 xx000000B
B7
B6
B5
B4
B3
B2
B1
B0
IPH#
Interrupt Priority High B7H
PT2H PSH PT1H PX1H PT0H PX0H xx000000B
87
86
85
84
83
82
81
80
P0*
Port 0
80H
AD7
AD6
AD5
AD4
AD3 AD2 AD1 AD0 FFH
97
96
95
94
93
92
91
90
P1*
Port 1
90H
– T2EX T2 FFH
A7
A6
A5
A4
A3
A2
A1
A0
P2*
Port 2
A0H AD15 AD14 AD13 AD12 AD11 AD10 AD9 AD8 FFH
B7
B6
B5
B4
B3
B2
B1
B0
P3*
Port 3
B0H
RD
WR
T1
T0
INT1 INT0 TxD RxD FFH
PCON#1 Power Control
87H SMOD1 SMOD0
POF2 GF1 GF0 PD
IDL 00xxx000B
D7
D6
D5
D4
D3
D2
D1
D0
PSW*
Program Status Word D0H
CY
AC
F0
RS1
RS0
OV
P
000000x0B
RACAP2H# Timer 2 Capture High CBH
00H
RACAP2L# Timer 2 Capture Low
CAH
00H
SADDR# Slave Address
A9H
00H
SADEN# Slave Address Mask
B9H
00H
SBUF
Serial Data Buffer
99H
xxxxxxxxB
9F
9E
9D
9C
9B
9A
99
98
SCON* Serial Control
98H SM0/FE SM1 SM2 REN
TB8
RB8
TI
RI 00H
SP
Stack Pointer
81H
07H
8F
8E
8D
8C
8B
8A
89
88
TCON* Timer Control
88H
TF1
TR1
TF0
TR0
IE1
IT1 IE0
IT0 00H
CF
CE
CD
CC
CB
CA
C9
C8
T2CON* Timer 2 Control
C8H
TF2 EXF2 RCLK TCLK EXEN2 TR2 C/T2 CP/RL2 00H
T2MOD# Timer 2 Mode Control C9H
– T2OE DCEN xxxxxx00B
TH0
Timer High 0
8CH
00H
TH1
Timer High 1
8DH
00H
TH2#
Timer High 2
CDH
00H
TL0
Timer Low 0
8AH
00H
TL1
Timer Low 1
8BH
00H
TL2#
Timer Low 2
CCH
00H
TMOD
Timer Mode
89H GATE C/T
M1
M0 GATE C/T M1
M0 00H
* SFRs are bit addressable.
# SFRs are modified from or added to the 80C51 SFRs.
– Reserved bits.
1. Reset value depends on reset source.
2. Bit will not be affected by reset.
2002 Jan 15
8
 

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