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[Previous] [Up] [Top] [Contents] [Back]Chapter 5 Programming Considerations
The local EPROM space runs from $000000 through $0FFFFF, where the address locations $000000-$000007 must contain the initial Supervisor Stack Pointer and Program Counter. The local SRAM space runs from $100000 through $1FFFFF, where the first four bytes are assigned to the mailbox. The mailbox can interrupt or reset the local processor.
The I/O devices are located in 1 MByte memory blocks from $300000-$C00000. The 8-bit peripheral devices only respond at odd addresses. Access to even addresses in the I/O device space will have no effect for write accesses and will return '$FF' on read.
Note that all devices are repeated in the memory map a number of times. The number of times depend on their own size and the space they occupy in the memory map.
| Address | Device |
|---|---|
| $000000 $0FFFFF |
Local EPROM Space 1 MByte (max) |
| $100000 $1FFFFF |
Local SRAM Space 1 MByte (max) |
| $200000 $2FFFFF |
Reserved |
| $300000 $3FFFFF |
Serial Interface |
| $400000 $4FFFFF |
DIP Switch Register |
| $500000 $5FFFFF |
Timer Interrupt / CAN Type / ID7 Register |
| $600000 $6FFFFF |
Module ID |
| $700000 $7FFFFF |
Interrupter |
| $800000 $8FFFFF |
CAN Controller Channel 0 |
| $900000 $9FFFFF |
CAN Controller Channel 1 |
| $A00000 $BFFFFF |
User LEDs and RSTOUT |
| $C00000 $FFFFFF |
Reserved |
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