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參數資料
| 型號： | HT82A821R |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | USB Audio MCU |
| 中文描述： | USB音頻控制器 |
| 文件頁數： | 5/39頁 |
| 文件大小： | 275K |
| 代理商： | HT82A821R |
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HT82A821R
Rev. 1.10
5
June 29, 2007
Functional Description
Execution Flow
The system clock for the micro-controller is from a crys-
tal oscillator. The system clock is internally divided into
four non-overlapping clocks. One instruction cycle con-
sists of four system clock cycles.
Instruction fetching and execution are pipelined in such
a way that a fetch takes an instruction cycle while de-
coding and execution takes the next instruction cycle.
However, the pipelining scheme causes each instruc-
tion to be effectively executed in a cycle. If an instruction
changestheprogramcounter,twocyclesarerequiredto
complete the instruction.
Program Counter
PC
The program counter (PC) controls the sequence in
which the instructions stored in the program ROM are
executed and its contents specify a full range of pro-
gram memory.
After accessing a program memory word to fetch an in-
struction code, the contents of the program counter are
incrementedbyone.Theprogramcounterthenpointsto
the memory word containing the next instruction code.
When executing a jump instruction, conditional skip ex-
ecution, loading to the PCL register, performing a sub-
routine call or return from subroutine, initial reset,
internal interrupt, external interrupt or return from inter-
rupts, the PC manipulates the program transfer by load-
ing the address corresponding to each instruction.
The conditional skip is activated by instructions. Once
the condition is met, the next instruction, fetched during
the current instruction execution, is discarded and a
dummy cycle replaces it to get the proper instruction.
Otherwise proceed with the next instruction.
The lower byte of the program counter (PCL) is a read-
able and writeable register (06H). Moving data into the
PCL performs a short jump. The destination will be
within the current program ROM page.
When a control transfer takes place, an additional
dummy cycle is required.
1
5
0
1
5
0
1
5
0
.
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Execution Flow
Mode
Program Counter
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
Initial Reset
0
0
0
0
0
0
0
0
0
0
0
USB Interrupt
0
0
0
0
0
0
0
0
1
0
0
Timer/EventCounter0Overflow
0
0
0
0
0
0
0
1
0
0
0
Timer/EventCounter1Overflow
0
0
0
0
0
0
0
1
1
0
0
Skip
Program Counter+2
Loading PCL
*10
*9
*8
@7
@6
@5
@4
@3
@2
@1
@0
Jump, Call Branch
#10
#9
#8
#7
#6
#5
#4
#3
#2
#1
#0
Return from Subroutine
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
Program Counter
Note: *10~*0: Program counter bits
S10~S0: Stack register bits
#10~#0: Instruction code bits
@7~@0: PCL bits
相關PDF資料 |
PDF描述 |
|---|---|
| HT82A821R_07 | USB Audio MCU |
| HT82A822R | USB Audio MCU |
| HT82A822R_07 | USB Audio MCU |
| HT82A832R | Basic USB Phone OTP MCU |
| HT82A850R | Audio MCU |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT82A821R_07 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU |
| HT82A822R | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU |
| HT82A822R_07 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU |
| HT82A824R | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU |
| HT82A832R | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Audio MCU |
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