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HT46R01 参数 Datasheet PDF下载

HT46R01图片预览
型号: HT46R01
PDF下载: 下载PDF文件 查看货源
内容描述: 10引脚MSOP A / D型8位OTP MCU [10-Pin MSOP A/D Type 8-Bit OTP MCU]
分类和应用:
文件页数/大小: 60 页 / 482 K
品牌: HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
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HT46R01/HT46R02/HT46R03  
Structure  
Special Function Registers  
The two sections of Data Memory, the Special Purpose  
and General Purpose Data Memory are located at con-  
secutive locations. All are implemented in RAM and are  
8 bits wide but the length of each memory section is dic-  
tated by the type of microcontroller chosen. The start  
address of the Data Memory for all devices is the ad-  
dress ²00H². Registers which are common to all  
microcontrollers, such as ACC, PCL, etc., have the  
same Data Memory address.  
To ensure successful operation of the microcontroller,  
certain internal registers are implemented in the Data  
Memory area. These registers ensure correct operation  
of internal functions such as timers, interrupts, etc., as  
well as external functions such as I/O data control and  
A/D converter operation. The location of these registers  
within the Data Memory begins at the address 00H. Any  
unused Data Memory locations between these special  
function registers and the point where the General Pur-  
pose Memory begins is reserved and attempting to read  
data from these locations will return a value of 00H.  
General Purpose Data Memory  
All microcontroller programs require an area of  
read/write memory where temporary data can be stored  
and retrieved for use later. It is this area of RAM memory  
that is known as General Purpose Data Memory. This  
area of Data Memory is fully accessible by the user pro-  
gram for both read and write operations. By using the  
²SET [m].i² and ²CLR [m].i² instructions individual bits  
can be set or reset under program control giving the  
user a large range of flexibility for bit manipulation in the  
Data Memory.  
Indirect Addressing Registers - IAR0, IAR1  
The Indirect Addressing Registers, IAR0 and IAR1, al-  
though having their locations in normal RAM register  
space, do not actually physically exist as normal regis-  
ters. The method of indirect addressing for RAM data  
manipulation uses these Indirect Addressing Registers  
and Memory Pointers, in contrast to direct memory ad-  
dressing, where the actual memory address is speci-  
fied. Actions on the IAR0 and IAR1 registers will result in  
no actual read or write operation to these registers but  
rather to the memory location specified by their corre-  
sponding Memory Pointer, MP0 or MP1. Acting as a  
pair, IAR0 with MP0 and IAR1 with MP1 can together ac-  
cess data from the Data Memory. As the Indirect Ad-  
dressing Registers are not physically implemented,  
reading the Indirect Addressing Registers indirectly will  
return a result of ²00H² and writing to the registers indi-  
rectly will result in no operation.  
Special Purpose Data Memory  
This area of Data Memory is where registers, necessary  
for the correct operation of the microcontroller, are  
stored. Most of the registers are both readable and  
writable but some are protected and are readable only,  
the details of which are located under the relevant Spe-  
cial Function Register section. Note that for locations  
that are unused, any read instruction to these addresses  
will return the value ²00H².  
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Data Memory Structure  
Note:  
Most of the Data Memory bits can be directly manipulated using the ²SET [m].i² and ²CLR [m].i² with the excep-  
tion of a few dedicated bits. The Data Memory can also be accessed through the memory pointer register MP.  
Rev. 1.00  
11  
September 21, 2007  
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