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參數(shù)資料
| 型號(hào)： | HT48RA0(24SOIC-A) |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 7/42頁 |
| 文件大?。?/td> | 259K |
| 代理商： | HT48RA0(24SOIC-A) |
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Functional Description
HT48R50A-1/HT48C50-1
Rev. 1.00
7
January 2, 2003
Execution flow
The system clock for the microcontroller is derived 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 instruction cycle while de-
coding and execution takes the next instruction cycle.
However, the pipelining scheme causes each instruc-
tion to effectively execute 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, initial re-
set, internal interrupt, external interrupt or return from
subroutine, 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 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 256 locations.
When a control transfer takes place, an additional
dummy cycle is required.
Program memory
ROM
The program memory is used to store the program in-
structions which are to be executed. It also contains
data, table, and interrupt entries, and is organized into
4096 15bits,addressedbytheprogramcounterandta-
ble pointer.
1
+
1
+
1
+
9
! ) *
* 6
8
:
! *
* 6
; 8
9
! ) *
* 6
<
8
:
! *
* 6
8
9
! ) *
* 6
<
8
:
! *
* 6
<
8
<
<
&
!
*
=
* 6
* & 8
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
External Interrupt
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
Skip
PC+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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| HT48RA0A(20SOP) | MICROCONTROLLER|8-BIT|CMOS|SOP|20PIN|PLASTIC |
| HT48RA0A(24SOP) | MICROCONTROLLER|8-BIT|CMOS|SOP|24PIN|PLASTIC |
| HT48RA0A-20SOP | 8-BIT MICROCONTROLLER |
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參數(shù)描述 |
|---|---|
| HT48RA0-3 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU |
| HT48RA0-5 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit OTP MCU |
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| HT48RA0A | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit Remote Type MCU |
| HT48RA0A(20SOP) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MICROCONTROLLER|8-BIT|CMOS|SOP|20PIN|PLASTIC |
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