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參數資料
| 型號： | HT48CA1 |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Remote Type 8-Bit MCU |
| 中文描述： | 遠程型8位微控制器 |
| 文件頁數： | 6/39頁 |
| 文件大小： | 308K |
| 代理商： | HT48CA1 |
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HT48RA1/HT48CA1
Rev. 1.00
6
June 25, 2004
Functional Description
Execution Flow
The system clock for the MCU is derived from either a
crystal or an RC oscillator. The system clock is internally
divided into four non-overlapping clocks. One instruc-
tion 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 register, subroutine call or return from
subroutine, initial reset, internal interrupt, external inter-
rupt 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 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.
* 1 4
4 6
7
8
( * 4
4 6
9 7
* 1 4
4 6
:
7
8
( * 4
4 6
7
* 1 4
4 6
:
7
8
( * 4
4 6
:
7
:
:
.
* ' 4
" % ;
4 6
4 % ) " . 7
Execution Flow
Mode
Program Counter
*12~*8
*7
*6
*5
*4
*3
*2
*1
*0
Initial Reset
00000
0
0
0
0
0
0
0
0
External Interrupt
00000
0
0
0
0
0
1
0
0
Timer/Event Counter 0 Overflow
00000
0
0
0
0
1
0
0
0
Timer/Event Counter 1 Overflow
00000
0
0
0
0
1
1
0
0
Skip
PC+2
Loading PCL
*12~*8
@7
@6
@5
@4
@3
@2
@1
@0
Jump, Call Branch
#12~#8
#7
#6
#5
#4
#3
#2
#1
#0
Return (RET, RETI)
S12~S8
S7
S6
S5
S4
S3
S2
S1
S0
Program Counter
Note:
*12~*0: Program counter bits
#12~#0: Instruction code bits
S12~S0: Stack register bits
@7~@0: PCL bits
相關PDF資料 |
PDF描述 |
|---|---|
| HT48RA1 | Remote Type 8-Bit MCU |
| HT48CA3 | 8-Bit Remote Type MCU |
| HT48E06 | 8-Bit I/O Type MCU (With EEPROM) |
| HT48E50 | I/O Type 8-Bit MTP MCU With EEPROM |
| HT48R05A-1 | 8-Bit High Performance RISC-like OTP Microcontroller(8位、高性能、類似RISC、一次可編程微控制器，用于多I/O接口設備) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT48CA3 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU |
| HT48CA5 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU |
| HT48CA6 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit Remote Type Low Voltage Mask MCU |
| HT48CU80 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:I/O Type 8-Bit MCU |
| HT48CXX | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:8-Bit Microcontroller Series |
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