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PDF DS89C420 Data sheet ( Hoja de datos )
| Número de pieza | DS89C420 | |
| Descripción | Ultra-High-Speed Microcontroller | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS89C420
Ultra-High-Speed Microcontroller
www.maxim-ic.com
GENERAL DESCRIPTION
The DS89C420 offers the highest performance
available in 8051-compatible microcontrollers. It
features a redesigned processor core that executes
every 8051 instruction (depending on the instruction
type) up to 12 times faster than the original for the
same crystal speed. Typical applications see a speed
improvement of 10 times using the same code and
crystal. The DS89C420 offers a maximum crystal
speed of 33MHz, achieving execution rates up to 33
million instructions per second (MIPS).
APPLICATIONS
Data Logging
Vending
Automotive Test Equipment
Motor Control
Magstripe Reader/Scanner
Consumer Electronics
Gaming Equipment
Appliances (Washers, Microwaves, etc.)
Telephones
HVAC
Building Security and Door Access Control
Building Energy Control and Management
Uninterruptible Power Supplies
Programmable Logic Controllers
Industrial Control and Automation
ORDERING INFORMATION
PART
TEMP RANGE
MAX.
CLOCK
SPEED
(MHz)
PIN-PACKAGE
DS89C420-
MCL
0°C to +70°C
33 40 PDIP
DS89C420-
QCL
0°C to +70°C
33 44 PLCC
DS89C420-
ECL
0°C to +70°C
33 44 TQFP
Ordering information continued at end of data sheet.
FEATURES
§ 80C52 Compatible
- 8051 Pin and Instruction-Set Compatible
- Four Bidirectional I/O Ports
- Three 16-Bit Timer Counters
- 256 Bytes Scratchpad RAM
§ On-Chip Memory
- 16kB Flash Memory
- In-System Programmable through Serial Port
- 1kB SRAM for MOVX
§ ROMSIZE Feature
- Selects Internal Program Memory Size from
0 to 16k
- Allows Access to Entire External Memory
Map
- Dynamically Adjustable By Software
See page 2 for a complete list of features.
PIN CONFIGURATIONS
TOP VIEW
P1.0/T2
P1.1/T2EX
P1.2/RXD1
P1.3/TXD1
P1.4/INT2
P1.5/INT3
P1.6/INT4
P1.7/INT5
RST
P3.0/RXD0
P3.1/TXD0
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
P3.6/WR
P3.7/RD
XTAL2
XTAL1
VSS
1 40
2 39
3 38
4 37
5 36
6 35
7 34
8 33
9 32
10 DS89C420 31
11 30
12 29
13 28
14 27
15 26
16 25
17 24
18 23
19 22
20 21
DIP
VCC
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
EA/VPP
ALE/PROG
PSEN
P2.7
P2.6
P2.5
P2.4
P2.3
P2.2
P2.1
P2.0
Pin Configurations continued at end of data sheet.
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
1 of 59
103102
1 page  
DS89C420
DIP
PIN
PLCC
TQFP
NAME
FUNCTION
1–8 2–9 40–44 P1.0–P1.7 Port 1, I/O. Port 1 functions as both an 8-bit, bidirectional I/O
1 port and an alternate functional interface for timer 2 I/O, new
2 external interrupts, and new serial port 1. The reset condition of
3 port 1 is with all bits at a logic 1. In this state, a weak pullup
holds the port high. This condition also serves as an input state,
since any external circuit that writes to the port overcomes the
weak pullup. When software writes a 0 to any port pin, the
DS89C420 activates a strong pulldown that remains on until
either a 1 is written or a reset occurs. Writing a 1 after the port
has been at 0 causes a strong transition driver to turn on,
followed by a weaker sustaining pullup. Once the momentary
strong driver turns off, the port again becomes the output high
(and input) state. The alternate functions of Port 1 are outlined
below.
1 2 40
2 3 41
3 4 42
4 5 43
5 6 44
6 71
7 82
8 93
PORT
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
ALTERNATE FUNCTION
T2 External I/O for Timer/Counter2
T2EX Timer 2 Capture/Reload Trigger
RXD1 Serial Port 1 Receive
TXD1 Serial Port 1 Transmit
INT2 External Interrupt 2 (Positive Edge Detect)
INT3 External Interrupt 3 (Negative Edge Detect)
INT4 External Interrupt 4 (Positive Edge Detect)
INT5 External Interrupt 5 (Negative Edge Detect)
21 24 18 P2.0 (A8) Port 2 (A8–15), I/O. Port 2 is an 8-bit, bidirectional I/O port.
22 25 19 P2.1 (A9) The reset condition of port 2 is logic high. In this state, a weak
23 26 20 P2.2 (A10) pullup holds the port high. This condition also serves as an
24 27 21 P2.3 (A11) input mode, since any external circuit that writes to the port
25
26
27
28
29
30
22
23
24
P2.4 (A12)
P2.5 (A13)
P2.6 (A14)
overcomes the weak pullup. When software writes a 0 to any
port pin, the DS89C420 activates a strong pulldown that
remains on until either a 1 is written or a reset occurs. Writing a
1 after the port has been at 0 causes a strong transition driver to
28 31 25 P2.7 (A15) turn on, followed by a weaker sustaining pullup. Once the
momentary strong driver turns off, the port again becomes both
the output high and input state. As an alternate function, port 2
can function as the MSB of the external address bus when
reading external program memory and read/write external
RAM or peripherals. In page mode 1, port 2 provides both the
MSB and LSB of the external address bus; in page mode 2, it
provides the MSB and data.
5 of 59
5 Page 
Table 3. SFR Reset Value
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
DS89C420
BIT6 BIT5
11
00
00
00
00
00
00
0 Special
00
00
00
00
00
00
00
11
00
10
00
00
00
11
00
00
00
11
00
00
00
00
00
00
11
00
00
11
00
11
00
00
11 of 59
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
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet DS89C420.PDF ] | |
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