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參數資料
| 型號： | HT48R50A-1 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | 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) |
| 中文描述： | 8位高性能RISC架構微控制器等的多個I / O應用（高性能，指令類似的RISC的8位微控制器，用于多予適用/輸出接口設備） |
| 文件頁數： | 8/50頁 |
| 文件大小： | 345K |
| 代理商： | HT48R50A-1 |
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Functional Description
HT48R50A-1
8
December 19, 2000
Execution flow
The system clock for the microcontroller is de-
rived from either a crystal or an RC oscillator.
The system clock is internally divided into four
non-overlapping clocks. One instruction cycle
consists of four system clock cycles.
Instruction fetching and execution are
pipelined in such a way that a fetch takes an in-
struction cycle while decoding and execution
takes the next instruction cycle. However, the
pipelining scheme causes each instruction to ef-
fectively execute in a cycle. If an instruction
changes the program counter, two cycles are re-
quired to complete the instruction.
Program counter
PC
The program counter (PC) controls the se-
quence in which the instructions stored in the
program ROM are executed and its contents
specify a full range of program memory.
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 contain-
ing the next instruction code.
When executing a jump instruction, conditional
skip execution, loading PCL register, subrou-
tinecallorreturnfromsubroutine,initialreset,
internal interrupt, external interrupt or return
from interrupts, the PC manipulates the pro-
gram transfer by loading the address corre-
sponding to each instruction.
The conditional skip is activated by instruc-
tions. Once the condition is met, the next in-
struction, fetched during the current
instruction execution, is discarded and a
dummy cycle replaces it to get the proper in-
struction. Otherwise proceed to the next in-
struction.
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 the cur-
rent program ROM page.
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 4096 15 bits, addressed
by the program counter and table pointer.
Certain locations in the program memory are
reserved for special usage:
Location 000H
This area is reserved for program initializa-
tion. After chip reset, the program always be-
gins execution at location 000H.
4
+
4
+
4
+
6 ! ) *
* 7
8
9 ! * * 7 : 8
6 ! ) *
* 7
; 8
9 ! * * 7 8
6 ! ) *
* 7
; 8
9 ! * * 7 ; 8
;
;
& ! * <
* 7 * & 8
Execution flow
相關PDF資料 |
PDF描述 |
|---|---|
| HT48R50A | 8-BIT MICROCONTROLLER |
| HT48RA0A | 8-Bit Remote Type MCU |
| HT48RA3 | 8-Bit Remote Type OTP MCU |
| HT48RB8 | 8-Bit USB Type OTP MCU |
| HT49C10 | 8-BIT MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT48R50A-1_09 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O Type 8-Bit MCU |
| HT48R51 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit Microcontroller Series |
| HT48R51-1(28SKDIP-H0) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| HT48R51-1(40DIP-A0) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| HT48R51-2(28SKDIP-H0) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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