[Virgil] Atmega32 ?

[Andreas KäŠnner]

Hi Benjamin
>
> thank you. I will try to modify the ATMega128 device description. I 
> understand the interrupt part and the IORegister part but can you 
> elaborate on the first statements:
>
>>    space data[16]: 8;
>>    space flash[24]: 8;
>>    space eeprom[16]: 8;
>
> These describe the address spaces of the device. The first number is 
> the number of bits required to represent a pointer, the second number 
> is the size of the addressable units. This information is parsed by 
> the compiler, but currently unused, because VPC generates C code.
>

Why is the number of bits to represent a pointer to the flash memory 24 
bits wide? The ATMega128 documentation says that the Program Counter is 
16 bits wide (and 14 bits for ATMega32).

>>    region regs   = data[0...31];
>>    region ioregs = data[32...255];
>>    region sram   = data[255...4351];
>
> These describe regions of memory within address spaces. They also are 
> currently unused.
>
>>    region itable = flash[0...139];
The ATMega128 contains 128K bytes of Flash memory. The highest number in 
your itable is 139. Please explain how to derive this value.

Thank you,

Andreas Känner