将汇编代码从17c756移植到16f1719时出现问题

嗯，我很确定RES在PIC16S上分配了正确的字节数。



      以下为原文

    Mmm, I am pretty sure that RES allocates that exact number of bytes on PIC16s...

不确定你所说的“2字”是什么，它将在RAM中分配2个地址，这些地址是用字节来处理的，所以它将是在那个标签上保留的2字节RAM。



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Not sure what you mean by "2 WORDS", it will allocate 2 addresses in the RAM, which is addressed in bytes,so it will be 2 bytes of RAM reserved at that label.

不，它应该按字节分配。



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No, it should allocate in bytes.

可能有些混淆来自于在MPASM指南中描述RES指令的这一行：我认为这指的是FLAS/ROM中的分配，而不是RAM中的分配。



      以下为原文

    Possibly some confusion comes from this line in the description of the RES directive in the MPASM guide:

I think this refers to allocation in FLASH/ROM but NOT in RAM....

因此，好像我误解了MPASM手册（如下所示）记录了列表文件输出，它们都分配了1字节。我确实说过它会很尴尬，不是吗？4.57）保留记忆4.57.1语法[Reals]标签ReMyUnITS4.57.2描述符导致内存位置指针从MeMyUnice中指定的值从当前位置提前。在可重定位代码（使用MPLink链接器）中，RES可以用来保留数据存储。在不可重新定位的代码中，标签被假定为程序存储器地址。地址位置用PIC12／16 MCU的字来定义，而PIC18MCU的字节则被定义。



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    So it seems as if I have misunderstood the MPASM manual (shown below)
I checked the list file outputs, and they both allocate 1 byte.
I did say that it would be embarassing, didn't I? :)
My apologies for having wasted your time..
 
 
4.57 res - RESERVE MEMORY
4.57.1 Syntax
[label] res mem_units
4.57.2 Description
Causes the memory location pointer to be advanced from its current location by the
value specified in mem_units. In relocatable code (using MPLINK linker), res can be
used to reserve data storage. In non-relocatable code, label is assumed to be a
program memory address.
Address locations are defined in words for PIC12/16 MCUs, and bytes for PIC18
MCUs.
 

您好，这可能是由于MPASM手册：在可重定位代码（使用MPLink链接器）中，RES可以用来保留数据存储。在不可重新定位的代码中，标签被假定为程序存储器地址。地址位置用PIC12／16 MCU的字来定义，而PIC18MCU的字节则用以表示是否使用不可移动或可重新定位的代码。因此，因为PIC12／16有12/14位，所以它只能被称为Word，所以每个（程序）存储器位置包含一个字，但是因为PIC18具有16位指令（2字节），程序存储器位置（Flash）包含1个字节。



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    Hi,
Maybe this is due to the MPASM manual :
================================================================
4.57.1 Syntax
[label] res mem_units
4.57.2 Description
Causes the memory location pointer to be advanced from its current location by the value specified in mem_units. In relocatable code (using MPLINK linker), res can be used to reserve data storage. In non-relocatable code, label is assumed to be a program memory address.
Address locations are defined in words for PIC12/16 MCUs, and bytes for PIC18 MCUs
================================================================
So it seems that it depens whether one uses non-relocatable or relocatable code.
Also because PIC12/16 has 12/14 bits it can only be referred as WORD so each (program) memory location contains one word but because PIC18 has 16 bits instructions (2 bytes) program memory locations (flash) contain 1 byte
Regards
 

对于程序存储器，RES保留PIC12／16的字和PIC18设备的字节，而不管代码的类型。对于数据存储器，RES在可重定位代码中保留字节。RES是NOTY，用于在绝对代码中保留数据存储器。



      以下为原文

   
For program memory, RES reserves words for PIC12/16 and bytes for PIC18 devices regardless of types of code.
 
For data memory, RES reserves bytes in relocatable code. RES is _not_ used to reserve data memory storage in absolute code.
 

在可重定位模式下，只能使用RAM来存储RAM。



      以下为原文

    As above.
RES can only be used to reserve RAM in relocatable mode.
I've never encountered its use in program memory in non-relocatable mode.
 

它可以用于保留某些PIC设备（如PIC12F675）的程序存储器的最后位置的校准指令，因此用户的代码不会覆盖该位置。例如。



      以下为原文

   
It can be used to reserve the calibration instruction in the last location of program memory for some PIC devices, such as PIC12F675, so the user's code does not overwrite this location. E.g.

        org 0x3FF
        res 1

 
 

谢谢）



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    Thanks :)

1和0似乎已经明确地回答了……手册并没有真正解释这个指令的（不必要的）歧义。谢谢大家。从现在起我就更加小心了。：）



      以下为原文

    1and0 seems to have definitively answered it...
The manual hasn't really explained the (unecessary) ambiguity of this directive.
Thanks everyone. I shall tread more carefully from now on.. :)