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參數(shù)資料
| 型號(hào)： | HT48R30A |
| 廠商： | Holtek Semiconductor Inc. |
| 元件分類： | 數(shù)學(xué)處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁(yè)數(shù)： | 6/43頁(yè) |
| 文件大?。?/td> | 710K |
| 代理商： | HT48R30A |
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Symbol
Parameter
Test Conditions
Min. Typ. Max. Unit
V
DD
Conditions
t
WDT2
Watchdog Time-out Period
(System Clock)
Without WDT
prescaler
1024
t
SYS
t
WDT3
Watchdog Time-out Period
(RTC OSC)
Without WDT
prescaler
7.812
ms
t
RES
External Reset Low Pulse
Width
1
s
t
SST
System Start-up Timer
Period
Wake-up from HALT
1024
t
SYS
t
INT
Interrupt Pulse Width
1
s
Functional Description
HT48R30A-1
Rev. 1.10
6
July 2, 2001
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 interrupt, 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 with the next in-
struction.
5
&
5
&
5
&
7 ! , '
' 8
9
: ! ' ' 8 ; 9
7 ! , '
' 8
< 9
: ! ' ' 8 9
7 ! , '
' 8
< 9
: ! ' ' 8 < 9
<
<
* ! ' =
' 8 ' * 9
Execution flow
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HT48R31-1 | 8-bit OTP Microcontrollers |
| HT48R31-2 | 8-bit OTP Microcontrollers |
| HT48R50-2(40DIP-A0) | 8-BIT MICROCONTROLLER |
| HT48R50-1(28SKDIP-H0) | 8-BIT MICROCONTROLLER |
| HT48R50-1(40DIP-A0) | 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT48R30A-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O Type 8-Bit MCU |
| HT48R30A-1_09 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O Type 8-Bit MCU |
| HT48R31 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit Microcontroller Series |
| HT48R31(18DIP-A0) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| HT48R31(20DIP-F0) | 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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