Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

DS89C420-MCL Datasheet(PDF) 8 Page - Maxim Integrated Products

Part # DS89C420-MCL
Description  Ultra-High-Speed Microcontroller
Download  58 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS89C420-MCL Datasheet(HTML) 8 Page - Maxim Integrated Products

Back Button DS89C420-MCL Datasheet HTML 4Page - Maxim Integrated Products DS89C420-MCL Datasheet HTML 5Page - Maxim Integrated Products DS89C420-MCL Datasheet HTML 6Page - Maxim Integrated Products DS89C420-MCL Datasheet HTML 7Page - Maxim Integrated Products DS89C420-MCL Datasheet HTML 8Page - Maxim Integrated Products DS89C420-MCL Datasheet HTML 9Page - Maxim Integrated Products DS89C420-MCL Datasheet HTML 10Page - Maxim Integrated Products DS89C420-MCL Datasheet HTML 11Page - Maxim Integrated Products DS89C420-MCL Datasheet HTML 12Page - Maxim Integrated Products Next Button
Zoom Inzoom in Zoom Outzoom out
 8 / 58 page
background image
DS89C420
8 of 58
both are faster than their original counterparts, they now have different execution times. This is because
the DS89C420 usually uses one machine cycle for each instruction byte and requires one cycle for
execution. The user concerned with precise program timing should examine the timing of each instruction
to become familiar with the changes.
SPECIAL FUNCTION REGISTERS (SFRs)
All peripherals and operations that are not explicit instructions in the DS89C420 are controlled through
SFRs. The most common features basic to the architecture are mapped to the SFRs. These include the
CPU registers (ACC, B, and PSW), data pointers (DPTRs), stack pointer, I/O ports, timer/counters, and
serial ports. In many cases, an SFR controls an individual function or reports the function’s status. The
SFRs reside in register locations 80h–FFh and are only accessible by direct addressing. SFRs whose
addresses end in 0h or 8h are bit-addressable.
All standard SFR locations from the 8051 are duplicated in the DS89C420 and several SFRs have been
added for the unique features of the DS89C420. Most of these features are controlled by bits in SFRs
located in unused locations in the 8051 SFR map. This allows for increased functionality while
maintaining complete instruction set compatibility. Table 2 summarizes the SFRs and their locations.
Table 3 specifies the default reset condition for all SFR bits.
DATA POINTERS
The data pointers (DPTR and DPTR1) are used to assign a memory address for the MOVX instructions.
This address can point to a MOVX RAM location (on-chip or off-chip), or a memory- mapped peripheral.
Two pointers are useful when moving data from one memory area to another, or when using a memory-
mapped peripheral for both source and destination addresses. The user selects the active pointer through a
dedicated SFR bit (Sel = DPS.0), or activates an automatic toggling feature for altering the pointer
selection (TSL = DPS.5). An additional feature, if selected, provides automatic incrementing or
decrementing of the current DPTR.
STACK POINTER
The stack pointer denotes the register location at the top of the stack, which is the last used value. The
user can place the stack anywhere in the scratchpad RAM by setting the stack pointer to the desired
location, although the lower bytes are normally used for working registers.
I/O PORTS
The DS89C420 offers four 8-bit I/O ports. Each I/O port is represented by an SFR location, and can be
written or read. The I/O port has a latch that contains the value written by software.
COUNTER/TIMERS
Three 16-bit timer/counters are available in the DS89C420. Each timer is contained in two SFR locations
that can be read or written by software. The timers are controlled by other SFRs described in the “SFR
Bit Description” section of the DS89C420 User’s Guide.
SERIAL PORTS
The DS89C420 provides two UARTs that are controlled and accessed by SFRs. Each UART has an
address that is used to read and write the UART. The same address is used for both read and write
operations, and the read and write operations are distinguished by the instruction. Each UART is
controlled by its own SFR control register.


Similar Part No. - DS89C420-MCL

ManufacturerPart #DatasheetDescription
logo
Dallas Semiconductor
DS89C420-MCL DALLAS-DS89C420-MCL Datasheet
539Kb / 59P
   Ultra-High-Speed Microcontroller
logo
Maxim Integrated Produc...
DS89C420-MCL MAXIM-DS89C420-MCL Datasheet
485Kb / 47P
   Ultra-High-Speed Microcontroller
REV: 081805
DS89C420-MCL MAXIM-DS89C420-MCL Datasheet
6Mb / 139P
   Ultra-High-Speed Flash Microcontroller User?셲 Guide
2004
More results

Similar Description - DS89C420-MCL

ManufacturerPart #DatasheetDescription
logo
Dallas Semiconductor
DS89C420 DALLAS-DS89C420 Datasheet
539Kb / 59P
   Ultra-High-Speed Microcontroller
logo
Maxim Integrated Produc...
DS89C420 MAXIM-DS89C420_05 Datasheet
485Kb / 47P
   Ultra-High-Speed Microcontroller
REV: 081805
DS89C420-QCL MAXIM-DS89C420-QCL Datasheet
6Mb / 139P
   Ultra-High-Speed Flash Microcontroller User?셲 Guide
2004
logo
Dallas Semiconductor
DS80C310 DALLAS-DS80C310_09 Datasheet
382Kb / 22P
   High-Speed Microcontroller
logo
Maxim Integrated Produc...
DS80C310 MAXIM-DS80C310 Datasheet
382Kb / 22P
   High-Speed Microcontroller
19-4859 ; Rev 8/09
logo
Dallas Semiconductor
DS5240 DALLAS-DS5240 Datasheet
43Kb / 3P
   High-Speed Secure Microcontroller
DS5250 DALLAS-DS5250_04 Datasheet
123Kb / 3P
   High-Speed Secure Microcontroller
DS5250-DS5250F DALLAS-DS5250-DS5250F Datasheet
123Kb / 3P
   High-Speed Secure Microcontroller
DS80C320-MCG DALLAS-DS80C320-MCG Datasheet
1Mb / 175P
   High-Speed Microcontroller User Guide
logo
List of Unclassifed Man...
KL5C80A12 ETC-KL5C80A12 Datasheet
252Kb / 1P
   Z80 COMPATIBLE HIGH SPEED MICROCONTROLLER
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com