Data Memo; Gene�Al P; Special P - Holtek BS83B24C Manual

(Secto� 0 ~ Secto� 1)
(Secto� 0 ~ Secto� 5)
Data Memory Addressing
For device that supports the extended instructions, there is no Bank Pointer for Data Memory. For
Data Memory the desired Sector is pointed by the MP1H or MP2H register and the certain Data
Memory address in the selected sector is specified by the MP1L or MP2L register when using
indirect addressing access.
Direct Addressing can be used in all sectors using the corresponding instruction which can address
all available data memory space. For the accessed data memory which is located in any data memory
sectors except sector 0, the extended instructions can be used to access the data memory instead
of using the indirect addressing access. The main difference between standard instructions and
extended instructions is that the data memory address "m" in the extended instructions can be up
to 11 valid bits for the devices, the high byte indicates a sector and the low byte indicates a specific
address.
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 programing for both reading
and writing operations. By using the bit operation 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.
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 writeable but some are
protected and are readable only, the details of which are located under the relevant Special Function
Register section. Note that for locations that are unused, any read instruction to these addresses will
return the value "00H".
Rev. 1.00
00H
Special P��pose
40H
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Secto� 1
Data Memory Structure – BS83C40C
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(Secto� 5 ~ Secto� 6)
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Secto� 5
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