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8. Parameter RAM Accesses
8.4
Address Nomenclature
All addresses are specified using the nearly universal byte mode. For instance, consider
the following memory dump.
The following read puts 0x6C7D4C85 into the P register.
ram p31_0 <- sprm0x0.
The following read puts 0x3CB12500 into the P register.
ram p31_0 <- sprm0x4.
8.5
diob Register Relative Accesses
The diob register can be used as a pointer for - PRAM accesses, as follows.
// Read the value from PRAM
// pointed to by the diob register
// into the P register
ram p <- by diob.
ram p -> by diob++.
// Post Increment
ram p -> by --diob.
// Pre-decrement
Fie ld: STC
8.6
Clearing Parameter RAM and Registers
Data RAM and the P or diob registers can be cleared (set to zero), as follows. Note that
when data RAM is being cleared, the size information is required as part of the opcode.
// Clear the diob register
ram diob <- #0.
// Clear some Channel RAM
ram #0 -> prm0x20, p_access_8.
ram #0 -> prm0x21, p_access_24.
ram #0 -> prm0x20, p_access_32.
Freescale Syntax
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Assembler Reference Manual, page 45