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參數(shù)資料
| 型號(hào)： | HPC467064 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High-Performance microController with a 16k UV Erasable CMOS EPROM |
| 中文描述： | 高性能的16K的紫外線可擦除的CMOS存儲(chǔ)器微控制器 |
| 文件頁數(shù)： | 30/34頁 |
| 文件大?。?/td> | 415K |
| 代理商： | HPC467064 |
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Code Efficiency
One of the most important criteria of a single chip microcon-
troller is code efficiency. The more efficient the code, the
more features that can be put on a chip. The memory size
on a chip is fixed so if code is not efficient, features may
have to be sacrificed or the programmer may have to buy a
larger, more expensive version of the chip.
The HPC family has been designed to be extremely code-
efficient. The HPC looks very good in all the standard cod-
ing benchmarks; however, it is not realistic to rely only on
benchmarks. Many large jobs have been programmed onto
the HPC, and the code savings over other popular micro-
controllers has been considerable.
Reasons for this saving of code include the following:
SINGLE BYTE INSTRUCTIONS
The majority of instructions on the HPC167064 are single-
byte. There are two especially code-saving instructions: JP
is a 1-byte jump. True, it can only jump within a range of plus
or minus 32, but many loops and decisions are often within
a small range of program memory. Most other micros need
2-byte instructions for any short jumps.
JSRP is a 1-byte subroutine call. The user makes a table of
the 16 most frequently called subroutines and these calls
will only take one byte. Most other micros require two and
even three bytes to call a subroutine. The user does not
have to decide which subroutine addresses to put into the
table; the assembler can give this information.
EFFICIENT SUBROUTINE CALLS
The 2-byte JSR instructions can call any subroutine within
plus or minus 1k of program memory.
MULTIFUNCTION INSTRUCTIONS FOR DATA MOVE-
MENT AND PROGRAM LOOPING
The HPC167064 has single-byte instructions that perform
multiple tasks. For example, the XS instruction will do the
following:
1. Exchange A and memory pointed to by the B register
2. Increment or decrement the B register
3. Compare the B register to the K register
4. Generate a conditional skip if B has passed K
The value of this multipurpose instruction becomes evident
when looping through sequential areas of memory and exit-
ing when the loop is finished.
BIT MANIPULATION INSTRUCTIONS
Any bit of memory, I/O or registers can be set, reset or
tested by the single byte bit instructions. The bits can be
addressed directly or indirectly. Since all registers and I/O
are mapped into the memory, it is very easy to manipulate
specific bits to do efficient control.
DECIMAL ADD AND SUBTRACT
This instruction is needed to interface with the decimal user
world.
It can handle both 16-bit words and 8-bit bytes.
The 16-bit capability saves code since many variables can
be stored as one piece of data and the programmer does
not have to break his data into two bytes. Many applications
store most data in 4-digit variables. The HPC167064 sup-
plies 8-bit byte capability for 2-digit variables and literal vari-
ables.
MULTIPLY AND DIVIDE INSTRUCTIONS
The HPC167064 has 16-bit multiply, 16-bit by 16-bit divide,
and 32-bit by 16-bit divide instructions. This saves both
code and time. Multiply and divide can use immediate data
or data from memory. The ability to multiply and divide by
immediate data saves code since this function is often
needed for scaling, base conversion, computing indexes of
arrays, etc.
Development Support
The HPC167064 acts as a stand alone emulator for either
the HPC16083 or the HPC16064. No separate development
tool is thus provided to support this emulator device. The
user will use either the HPC16083 or the HPC16064 (de-
pending on which device is in use) development tools to
develop and debug the application hardware and software
in their target as normally done for the non-emulator HPC
devices. The application software can then be programmed
in the on-chip EPROM and the HPC167064 can then be
plugged in the target system to run the application like a
regular masked ROM device. The HPC167064 can be pro-
grammed using a DATA I/O UNISITE with pinsite module.
To support the security feature of the HPC167064, a soft-
ware switch is provided with the linker (under PROMHPC)
which will generate an encrypted hex file for the user. The
purpose is to be able to compare this software generated
encrypted data with the encrypted data produced by the
actual chip to provide a way to verify on-chip EPROM code
after security has been enabled. For details of how to gener-
ate encrypted data and all other HPC167064 features, refer
to the Appendix K of the HPC Family User’s Manual.
30
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| HPC467064/EL30 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:16-Bit Microcontroller |
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| HPC4844AE | 制造商:HEWLETT PACKARD 功能描述:INK CARTRIDGE C4844AE BLK 制造商:HEWLETT PACKARD 功能描述:INK CARTRIDGE, C4844AE, BLK |
| HPC4C100K | 功能描述:陶瓷復(fù)合電阻器 4W 10 ohm 10% RoHS:否 制造商:KOA Speer 電阻:1 kOhms 容差:10 % 功率額定值:1 W 電壓額定值:500 V 系列:PCF 溫度系數(shù):- 1200 PPM / K 端接類型:Axial 尺寸:5.5 mm Dia. x 16.5 mm L 工作溫度范圍:- 40 C to + 200 C 封裝:Reel |
| HPC4C101K | 功能描述:陶瓷復(fù)合電阻器 4W 100 ohm 10% RoHS:否 制造商:KOA Speer 電阻:1 kOhms 容差:10 % 功率額定值:1 W 電壓額定值:500 V 系列:PCF 溫度系數(shù):- 1200 PPM / K 端接類型:Axial 尺寸:5.5 mm Dia. x 16.5 mm L 工作溫度范圍:- 40 C to + 200 C 封裝:Reel |
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