1 / 13

PIC Microcontroller

PIC Microcontroller. What is PC LATH?????. Memory Classification. Memory. Program Memory (Flash). Data Memory. General Purpose RAM. Special Function Registers. Program Memory Organization. 8k x 14 program memory space Divided into 4 pages of 2k words each 0H to 7FFH

gram
Télécharger la présentation

PIC Microcontroller

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. PIC Microcontroller What is PC LATH?????

  2. Memory Classification Memory Program Memory (Flash) Data Memory General Purpose RAM Special Function Registers

  3. Program Memory Organization • 8k x 14 program memory space • Divided into 4 pages of 2k words each • 0H to 7FFH • 800H to FFFH • 1000H to 17FFH • 1800H to 1FFFH • Program PCLATH to switch between pages

  4. Program Memory Organization PCLATH<4:3> = 00 PCLATH<4:3> = 10 0000h Reset Page 2 1000h 0004h Interrupt Page 0 07FFh 17FFh PCLATH<4:3> = 01 PCLATH<4:3> = 11 Page 3 Page 1 1800h 0800h 1FFFh 0FFFh

  5. Program Memory Map

  6. Vectors • Reset Vector • Reset forces PC to 0x0000 H • Clears the PCLATH So? • Interrupt Vector • Interrupt forces PC to 0x0004 H • PCLATH is not modified

  7. Program Counter • PC is 13 bits wide • Low byte – PCL is readable & writable • High byte – PCH is not directly readable or writable • All updates to PCH goes through PCLATH

  8. Program Counter

  9. Program Counter

  10. Stack • 8 level deep x 13 bit wide • Not part of either program space or data space • Stack pointer is not readable or writable

  11. Stack • PCLATH is not modified with a stack operation • No status bits to indicate status overflow or underflow conditions • No instructions called PUSH or POP

More Related