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參數資料
| 型號： | HT48RA0 |
| 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： | 4/32頁 |
| 文件大小： | 238K |
| 代理商： | HT48RA0 |
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HT48RA0-2/HT48CA0-2
Rev. 1.50
4
July 23, 2004
Program Counter
PC
The 10-bit program counter (PC) controls the sequence
in which the instructions stored in program ROM are ex-
ecuted and its contents specify a maximum of 1024 ad-
dresses.
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 or return from subroutine, the PC manipulates the
program transfer by loading the address corresponding
to each instruction.
The conditional skip is activated by instruction. 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 and table and is organized into 1024 14 bits, ad-
dressed by the program counter and table pointer.
Certain locations in the program memory are reserved
for special usage:
Location 000H
This area is reserved for the initialization program. Af-
ter chip reset, the program always begins execution at
location 000H.
Table location
Any location in the EPROM space can be used as
look-up tables. The instructions TABRDC [m] (the cur-
rent page, one page=256 words) and TABRDL [m]
(the last page) transfer the contents of the lower-order
byte to the specified data memory, and the
Mode
Program Counter
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
Initial reset
0
0
0
0
0
0
0
0
0
0
Skip
PC+2
Loading PCL
*9
*8
@7
@6
@5
@4
@3
@2
@1
@0
Jump, call branch
#9
#8
#7
#6
#5
#4
#3
#2
#1
#0
Return from subroutine
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
Program Counter
Note:
*9~*0: Program counter bits
S9~S0: Stack register bits
#9~#0: Instruction code bits
@7~@0: PCL bits
$ $ $ =
.
#
1 >
#
* # @
< : #
@ 1 # 7 0 3 # A
8
$ $ =
< : #
@ 1 # 7 0 3 # A
8
2 , , =
6
B # #
# "
# $ #
# 2
, , =
Program Memory
Instruction(s)
Table Location
*9
*8
*7
*6
*5
*4
*3
*2
*1
*0
TABRDC [m]
P9
P8
@7
@6
@5
@4
@3
@2
@1
@0
TABRDL [m]
1
1
@7
@6
@5
@4
@3
@2
@1
@0
Table Location
Note:
*9~*0: Table location bits
P9~P8: Current program counter bits
@7~@0: Table pointer bits
相關PDF資料 |
PDF描述 |
|---|---|
| HT48RA0-2 | Remote Type 8-Bit MCU |
| HT48CA0 | 8-BIT MICROCONTROLLER |
| HT48CA1 | Remote Type 8-Bit MCU |
| HT48RA1 | Remote Type 8-Bit MCU |
| HT48CA3 | 8-Bit Remote Type MCU |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT48RA0(20DIP-A) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| HT48RA0(20SOIC-A) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| HT48RA0(24SOIC-A) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| HT48RA0-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU |
| HT48RA0-2 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:Remote Type 8-Bit MCU |
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