 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
EM78452 Datasheet(PDF) 9 Page - ELAN Microelectronics Corp |
|
||||||||||||||||||||||||||||||
EM78452 Datasheet(HTML) 9 Page - ELAN Microelectronics Corp |
|
|
9 / 54 page  EM78452 8-Bit Microcontroller Product Specification (V1.0) 10.18.2007 • 5 (This specification is subject to change without further notice) "JMP" instruction allows direct loading of the lower 10 program counter bits. Thus, "JMP" allows it to jump to any location on one page. "CALL" instruction loads the lower 10 bits of the PC, and then PC+1 is pushed into the stack. Thus, the subroutine entry address can be located anywhere within a page "RET" ("RETL k", "RETI") instruction loads the program counter with the contents at the top of the stack. "MOV R2, A" allows the loading of an address from the "A" register to the lower 8 bits of PC, and the ninth and tenth bits (A8~A9) of the PC are cleared. "ADD R2, A" allows a relative address to be added to the current PC, and the ninth and tenth bits of the PC are cleared. Any instruction that is written to R2 (e.g. "ADD R2, A", "MOV R2, A", "BC R2,6", ⋅⋅⋅⋅⋅) (except "TBL") will cause the ninth and tenth bits (A8~A9) of the PC to be cleared. Thus, the computed jump is limited to the first 256 locations of any program page. "TBL" allows a relative address to be added to the current PC (R2+A →R2), and contents of the ninth and tenth bits (A8~A9) of the PC are not changed. Thus, the computed jump can be on the second (or third, 4th) 256th locations on one program page. In the case of EM78452, the most significant bits (A10~A11) will be loaded with the contents of bits PS0~PS1 in the status register (R3) upon the execution of a "JMP", "CALL", or any other instructions which writes to R2. All instructions are single instruction cycle (fclk/2 or fclk/4 except for instructions that would change the contents of R2. Such instruction will need one more instruction cycle. A7 ~ A0 On-chip Program Memory 000H FFFH 001H Hardware Vector Software Vector Reset Vector 002H A9 A8 A11 A10 Stack Level 1 Stack Level 3 Stack Level 2 Stack Level 4 Stack Level 5 CALL 00 PAGE0 0000~03FF 01 PAGE1 0400~07FF 10 PAGE2 0800~0BFF 11 PAGE3 0C00~0FFF R3 RET RETL RETI Fig. 5-2 Program Counter Organization |
Similar Part No. - EM78452 |
|
Similar Description - EM78452 |
|
|
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
