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DS89C420 Datasheet(PDF) 11 Page - Maxim Integrated Products

Part # DS89C420
Description  Ultra-High-Speed Microcontroller
Download  58 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS89C420 Datasheet(HTML) 11 Page - Maxim Integrated Products

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


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