 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
HT82R732 Datasheet(PDF) 11 Page - Holtek Semiconductor Inc |
|
||||||||||||||||||||||||||||||
HT82R732 Datasheet(HTML) 11 Page - Holtek Semiconductor Inc |
|
|
11 / 74 page  For instructions involving branches, such as jump or call instructions, two instruction cycles are required to complete instruction execution. An extra cycle is required as the program takes one cycle to first obtain the actual jump or call address and then another cycle to actually execute the branch. The requirement for this extra cycle should be taken into account by programmers in timing sensitive applications. Program Counter 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 ²JMP² or ²CALL² that demand a jump to a non-consecutive Program Memory address. Note that the Program Counter width varies with the Program Memory capacity depending upon which device is selected. However, 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 PC11~PC8 PCL7~PCL0 The lower byte of the Program Counter, known as the Program Counter Low register or PCL, is avail- able 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 avail- able 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. HT82R732 e-Banking 8-Bit OTP MCU Rev. 1.00 11 October 31, 2013 F e t c h I n s t . 1 E x e c u t e I n s t . 1 F e t c h I n s t . 2 F l u s h P i p e l i n e 1 2 3 4 5 6 D E L A Y : M O V A , [ 1 2 H ] C A L L D E L A Y C P L [ 1 2 H ] : : N O P E x e c u t e I n s t . 2 F e t c h I n s t . 3 F e t c h I n s t . 6 E x e c u t e I n s t . 6 F e t c h I n s t . 7 Instruction Fetching |
Similar Part No. - HT82R732 |
|
Similar Description - HT82R732 |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
