1 / 7

ECE 447: Lecture 6

ECE 447: Lecture 6. Program Sections. $0000. $1000. $1000-$103F 64 bytes I/O registers. $2000. $2000-$B5FF 37.5 kbytes. $B600-$B7FF 512 bytes EEPROM. $B600. $D000. $D000-$FFFF 12 kbytes ROM. $FFFF. Expanded bus mode. ECE 447: 68HC11E9 Memory Map. External RAM.

zeph-hill
Download Presentation

ECE 447: Lecture 6

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. ECE 447: Lecture 6 Program Sections

  2. $0000 $1000 $1000-$103F 64 bytes I/O registers $2000 $2000-$B5FF 37.5 kbytes $B600-$B7FF 512 bytes EEPROM $B600 $D000 $D000-$FFFF 12 kbytes ROM $FFFF Expanded bus mode ECE 447: 68HC11E9 Memory Map External RAM External RAM recommended for use recommended for use External RAM

  3. $0000-$01FF 512 bytes RAM $0000 $1000 $1000-$103F 64 bytes I/O registers $2000 Program area - text External RAM $6000 Data area – data External RAM $B600-$B7FF 512 bytes EEPROM $B600 $D000 $FFFF ECE 447: Linker memory.x map

  4. ECE 447: memory.x MEMORY { page0 (rwx) : ORIGIN = 0x0, LENGTH = 512 /* Board with 32K ROM. */ text (rx) : ORIGIN = 0x2000, LENGTH = 0x4000 data (rwx) : ORIGIN = 0x6000, LENGTH = 0x5600 eeprom (rwx) : ORIGIN = 0xB600, LENGTH = 0x0200 } /* Setup the stack on the top of the data memory bank. */ PROVIDE (_stack = 0xB600 - 1);

  5. $0000-$01FF 512 bytes RAM $0000 .page0 $1000 $1000-$103F 64 bytes I/O registers $2000 .text Program area - text External RAM .data $6000 Data area – data External RAM $B600-$B7FF 512 bytes EEPROM $B600 .eeprom $D000 $FFFF ECE 447: What goes where?

  6. .text1 .text1 Assembler Source 1 .data1 .text2 .bss1 .data1 Linker .data2 .text2 Assembler .bss1 Source 2 .data2 .bss2 .bss2 Object Source Binary (Object) Note: .bss section holds uninitialized reserved data (global variables) It is sometimes just included in the .data section ECE 447: Multiple files?

  7. $1000 $2000 $6000 $B600 $D000 $FFFF ECE 447: What about the stack? MEMORY { page0 (rwx) : ORIGIN = 0x0, LENGTH = 512 /* Board with 32K ROM. */ text (rx) : ORIGIN = 0x2000, LENGTH = 0x4000 data (rwx) : ORIGIN = 0x6000, LENGTH = 0x5600 eeprom (rwx) : ORIGIN = 0xB600, LENGTH = 0x0200 } /* Setup the stack on the top of the data memory bank. */ PROVIDE (_stack = 0xB600 - 1); External RAM .data External RAM stack .eeprom

More Related