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參數(shù)資料
| 型號： | HT82K94A |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | USB Multimedia Keyboard Encoder 8-Bit MCU |
| 中文描述： | 的USB多媒體鍵盤編碼器8位微控制器 |
| 文件頁數(shù)： | 6/44頁 |
| 文件大?。?/td> | 295K |
| 代理商： | HT82K94A |
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Functional Description
HT82K94E/HT82K94A
Rev. 1.00
6
November 22, 2005
Execution Flow
The system clock for the microcontroller is derived from
a crystal (6 or 12MHz). The system clock is internally di-
vided 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 de-
coding and execution takes the next instruction cycle.
However, the pipelining scheme allows each instruction
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 PCL register, subroutine call or return
from subroutine, initial reset, internal interrupt, external
interrupt or return from interrupts, the PC manipulates
the program transfer by loading the address corre-
sponding 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 to 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.
.
*
.
*
.
*
8
$ (
( 9
:
;
(
( 9
5 :
8
$ (
( 9
4
:
;
(
( 9
:
8
$ (
( 9
4
:
;
(
( 9
4
:
4
4
!
(
,
<
( 9
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, :
Execution Flow
Mode
Program Counter
*12
*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
0
External Interrupt
0
0
0
0
0
0
0
0
0
0
1
0
0
Timer/Event Counter 0 Overflow
0
0
0
0
0
0
0
0
0
1
0
0
0
Timer/Event Counter 1 Overflow
0
0
0
0
0
0
0
0
0
1
1
0
0
Skip
Program Counter+2
Loading PCL
*12
*11
*10
*9
*8
@7
@6
@5
@4
@3
@2
@1
@0
Jump, Call Branch
#12
#11
#10
#9
#8
#7
#6
#5
#4
#3
#2
#1
#0
Return from Subroutine
S12
S11
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
Program Counter
Note: *12~*0: Program counter bits
S12~S0: Stack register bits
#12~#0: Instruction code bits
@7~@0: PCL bits
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HT82K94E | USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K94E_07 | USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K95AE | USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K95EE | USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K95A | USB Multimedia Keyboard Encoder 8-Bit MCU |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HT82K94E | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K94E_07 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K95A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K95AE | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Multimedia Keyboard Encoder 8-Bit MCU |
| HT82K95E | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:USB Multimedia Keyboard Encoder 8-Bit MCU |
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