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HT98R068-1 Datasheet(PDF) 17 Page - Holtek Semiconductor Inc

Part # HT98R068-1
Description  Two Way Radio 8-Bit MCU
Download  116 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT98R068-1 Datasheet(HTML) 17 Page - Holtek Semiconductor Inc

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Rev. 1.10
16
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Rev. 1.10
17
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HT98R068-1
Two Way Radio 8-Bit MCU
HT98R068-1
Two Way Radio 8-Bit MCU
Fe tc h In st . 1E xe cu te In s t. 1
Fe tc h In s t. 2
Fl us h Pi pe lin e
1
2
3
4
5
6D EL AY:
MO V A, [1 2H ]
CA LL D EL AY
CP L [ 12H ]
:
:
NO P
Ex ec ut e In st . 2
Fe tc h In s t. 3
Fe tc h In s t. 6
Ex ec ut e In st . 6
Fe tc h In st . 7
Instruction Fetching
Program Counter – PC
During program execution, the Program Counter is used to keep track of the address of the
next instruction to be executed. It is automatically incremented by one each time an instruction
is executed except for instructions, such as “JMP” or “CALL” that demand a jump to a non-
consecutive Program Memory address. It must be noted that only the lower 8 bits, known as the
Program Counter Low Register, are directly addressable by user.
When executing instructions requiring jumps to non-consecutive addresses such as a jump
instruction, a subroutine call, interrupt or reset, etc. the microcontroller manages program control
by loading the required address into the Program Counter. For conditional skip instructions, once
the condition has been met, the next instruction, which has already been fetched during the present
instruction execution, is discarded and a dummy cycle takes its place while the correct instruction is
obtained.
Program Counter
Program Counter High Byte
PCL Register Low Byte
PC1�~PC8
PCL7~PCL0
13 12
87
0
Pr og ra m Co un te r
BP
.5
Bank Pointer (BP)
The lower byte of the Program Counter, known as the Program Counter Low register or PCL, is
available for program control and is a readable and writeable register. By transferring data directly
into this register, a short program jump can be executed directly, however, as only this low byte
is available for manipulation, the jumps are limited to the present page of memory, that is 256
locations. When such program jumps are executed it should also be noted that a dummy cycle
will be inserted. The lower byte of the Program Counter is fully accessible under program control.
Manipulating the PCL might cause program branching, so an extra cycle is needed to pre-fetch.
Further information on the PCL register can be found in the Special Function Register section.


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