DS89C420_02 Datasheet, PDF (11/58 Pages) Maxim Integrated Products – Ultra-High-Speed Microcontroller

Table 3. SFR RESET VALUE
DS89C420
REGISTER
P0
SP
DPL
DPH
DPL1
DPH1
DPS
PCON
TCON
TMOD
TL0
TL1
TH0
TH1
CKCON
P1
EXIF
CKMOD
SCON0
SBUF0
ACON
P2
IE
SADDR0
SADDR1
P3
IP1
IP0
SADEN0
SADEN1
SCON1
SBUF1
ROMSIZE
PMR
STATUS
TA
T2CON
T2MOD
RCAP2L
RCAP2H
ADDR
80h
81h
82h
83h
84h
85h
86h
87h
88h
89h
8Ah
8Bh
8Ch
8Dh
8Eh
90h
91h
96h
98h
99h
9Dh
A0h
A8h
A9h
AAh
B0h
B1h
B8h
B9h
BAh
C0h
C1h
C2h
C4h
C5h
C7h
C8h
C9h
CAh
CBh
BIT7
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
1
0
0
0
1
1
1
0
0
0
0
1
1
0
1
0
1
0
0
BIT6
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
0
0
1
0
0
0
1
0
0
0
0
0
0
1
0
0
1
0
1
0
0
BIT5
1
0
0
0
0
0
0
Special
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
0
1
0
0
1
0
1
0
0
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BIT4
1
0
0
0
0
0
0
Special
0
0
0
0
0
0
0
1
0
0
0
0
1
1
0
0
0
1
0
0
0
0
0
0
1
0
1
1
0
1
0
0
BIT3
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Special
0
0
0
1
1
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
1
0
0
BIT2
1
1
0
0
0
0
1
0
0
0
0
0
0
0
0
1
Special
1
0
0
1
1
0
0
0
1
0
0
0
0
0
0
1
0
0
1
0
1
0
0
BIT1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Special
1
0
0
1
1
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
0
0
0
BIT0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
1
0
0
1
1
0
0
0
1
0
0
0
0
0
0
1
0
0
1
0
0
0
0