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HT48CA0 Datasheet(PDF) 9 Page - Holtek Semiconductor Inc

Part # HT48CA0
Description  8-bit Microcontroller
Download  36 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48CA0 Datasheet(HTML) 9 Page - Holtek Semiconductor Inc

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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
Notes: *9~*0: Table location bits
@7~@0: Table pointer bits
P9~P8: Current program counter bits
The special function registers include the indirect
addressing register (00H), the memory pointer
register (MP;01H), the accumulator (ACC;05H)
the program counter lower-order byte register
(PCL;06H), the table pointer (TBLP;07H), the ta-
ble higher-order byte register (TBLH;08H), the
status register (STATUS;0AH) and the I/O regis-
ters (PA;12H, PB;14H, PC;16H). The remaining
space before the 20H is reserved for future ex-
panded usage and reading these locations will
return the result 00H. The general purpose data
memory, addressed from 20H to 3FH, is used for
data and control information under instruction
command.
All data memory areas can handle arithmetic,
logic, increment, decrement and rotate opera-
tions directly. Except for some dedicated bits,
each bit in the data memory can be set and reset
by the SET [m].i and CLR [m].i instructions,
respectively. They are also indirectly accessible
through memory pointer register (MP;01H).
Indirect addressing register
Location 00H is an indirect addressing register
that is not physically implemented. Any
read/write operation of [00H] accesses data
memory pointed to by MP (01H). Reading loca-
tion 00H itself indirectly will return the result
00H. Writing indirectly results in no operation.
The memory pointer register MP (01H) is a 6-bit
register. The bit 7~6 of MP is undefined and
reading will return the result “1”. Any writing
operation to MP will only transfer the lower 6-bit
data to MP.
RAM mapping
HT48CA0
9
23rd July ’98


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