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參數(shù)資料
| 型號： | HT47C20L |
| 廠商： | Holtek Semiconductor Inc. |
| 元件分類： | 數(shù)學處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 9/55頁 |
| 文件大?。?/td> | 341K |
| 代理商： | HT47C20L |
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HT47C20L
9
January 18, 2000
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Execution flow
Functional Description
Execution flow
The HT47C20L system clock is derived from a
32768Hz crystal oscillator. The system clock is
internally divided into four non-overlapping
clocks(T1,T2,T3andT4).Oneinstructioncycle
consists of four system clock cycles.
Instruction fetching and execution are
pipelined in such a way that a fetch takes one
instruction cycle while decoding and execution
takes the next instruction cycle. However, the
pipelining scheme causes each instruction to ef-
fectively execute in one cycle. If an instruction
changes the program counter, two cycles are re-
quired to complete the instruction.
Program counter
PC
The 11-bit program counter (PC) controls the
sequence in which the instructions stored in the
program ROM are executed and its contents
specify a maximum of 2048 addresses.
After accessing a program memory word to fetch
an instruction code, the contents of the program
counter are incremented by one. The program
counter then points to the memory word con-
taining the next instruction code.
When executing a jump instruction, conditional
skip execution, loading PCL register, subrou-
tine call, initial reset, internal interrupt, exter-
nal interrupt or return from subroutine, the PC
manipulates the program transfer by loading
the address corresponding to each instruction.
The conditional skip is activated by instruction.
Once the condition is met, the next instruction,
fetched during the current instruction execu-
tion, is discarded and a dummy cycle replaces it
to get the proper instruction. Otherwise pro-
ceed with the next instruction.
The lower byte of the program counter (PCL) is
a readable and writeable register (06H).
Moving data into the PCL performs a short
jump. The destination will be within 256 loca-
tions.
When a control transfer takes place, an addi-
tional dummy cycle is required.
Program memory
ROM
The program memory is used to store the pro-
gram instructions which are to be executed. It
also contains data, table, and interrupt entries,
and is organized into 2048 16 bits, addressed
by the program counter and table pointer.
Certain locations in the program memory are
reserved for special usage:
Location 000H
Thisareaisreservedfortheinitializationpro-
gram. After chip reset, the program always
begins execution at location 000H.
Location 004H
This area is reserved for the external inter-
rupt service program. If the INT input pin is
activated, and the interrupt is enabled and
相關PDF資料 |
PDF描述 |
|---|---|
| HT47C20 | 8-BIT MICROCONTROLLER |
| HT47R20 | 8 位R-F 型OTP 單片機 |
| HT48C05 | Cost-Effective I/O Type 8-Bit MCU |
| HT48C06 | Cost-Effective I/O Type 8-Bit MCU |
| HT48C10-1 | 8-Bit High Performance RISC-like Microcontroller Suitable for Multiple I/O Application(高性能、指令類似RISC的8位微控制器，用于多I/O接口設備) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HT47C20L_05 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:R-F Type Low Voltage 8-Bit Mask MCU |
| HT47M50 | 制造商:NTE Electronics 功能描述: |
| HT47R10A-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:R-F Type 8-Bit MCU |
| HT47R20 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8 位R-F 型OTP 單片機 |
| HT47R20A-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:R-F Type 8-Bit MCU |
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