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HT98R068-1 Datasheet(PDF) 17 Page - Holtek Semiconductor Inc |
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HT98R068-1 Datasheet(HTML) 17 Page - Holtek Semiconductor Inc |
17 / 116 page Rev. 1.10 16 �e���a�� 1�� �01� Rev. 1.10 17 �e���a�� 1�� �01� 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. |
Similar Part No. - HT98R068-1_13 |
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Similar Description - HT98R068-1_13 |
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