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參數(shù)資料
| 型號： | HT82A851R |
| 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(shù)： | 5/43頁 |
| 文件大?。?/td> | 304K |
| 代理商： | HT82A851R |
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HT82A851R
Rev. 1.20
5
June 15, 2007
Functional Description
Execution Flow
The microcontroller system clock is sourced from a
crystal 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 instruction cycle while
decoding and execution takes the next instruction cycle.
However, the pipelining scheme causes each
instruction to be effectively executed in a cycle. If an
instruction changes the program counter, two cycles are
required to complete the instruction.
Program Counter
PC
The program counter, PC, controls the sequence in
whichtheinstructionsstoredintheprogrammemoryare
executed. Its contents specify the full program memory
range.
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 containing the next
instruction code.
When executing a jump instruction, a conditional skip
execution, loading to the PCL register, performing a
subroutine call or returning from a subroutine, an initial
reset, an internal interrupt, external interrupt or return
from interrupts, the PC manipulates the program
transfer by loading 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 the next instruction is executed.
The lower byte of the program counter, PCL, is a
readable and writeable register. Moving data into the
PCL performs a short jump. The destination will be
within the current program memory page.
When a control transfer takes place, an additional
dummy cycle is required.
1
3
0
1
3
0
1
3
0
.
" %
% 4
6
' ;
%
% 4
< 6
.
" %
% 4
=
6
' ;
%
% 4
6
.
" %
% 4
= 1 6
' ;
%
% 4
=
6
=
= 1
%
&
>
1 % 4
%
& 6
Execution Flow
Mode
Program Counter
*11
*10
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
Initial Reset
0
0
0
0
0
0
0
0
0
0
0
0
Reserved
0
0
0
0
0
0
0
0
0
1
0
0
Timer/EventCounter0Overflow
0
0
0
0
0
0
0
0
1
0
0
0
Timer/EventCounter1Overflow
0
0
0
0
0
0
0
0
1
1
0
0
Play Interrupt
0
0
0
0
0
0
0
1
0
0
0
0
Serial Interface Interrupt
0
0
0
0
0
0
0
1
0
1
0
0
Record Interrupt
0
0
0
0
0
0
0
1
1
0
0
0
Skip
Program Counter+2
Loading PCL
*11
*10
*9
*8
@7
@6
@5
@4
@3
@2
@1
@0
Jump, Call Branch
#11
#10
#9
#8
#7
#6
#5
#4
#3
#2
#1
#0
Return from Subroutine
S11
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
Program Counter
Note: *11~*0: Program counter bits
S11~S0: Stack register bits
#11~#0: Instruction code bits
@7~@0: PCL bits
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT82B40A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O MCU with USB Interface |
| HT82B40R | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O MCU with USB Interface |
| HT82B40R_11 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O MCU with USB Interface |
| HT82B42R | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O MCU with USB Interface |
| HT82B42RE | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O MCU with USB Interface |
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