Post by thread:[PIC]: Confusion on hex format?

I'm following the assembly code in worktime.asm to get me (back) up to speed on assembly language. There's a bit where it goes. ; Macro EStrobe MACRO ; Strobe the "E" Bit bsf E bcf E ENDM CBLOCK 0CH sec ; seconds digit sec10 ; 10's of second digit mins ; minutes digit min10 ; 10's of minutes digit hr ; hours digit hr10 ; 10's of hours digit highlim ; high limit + 1 of digit w_temp ; holds W during interrupt status_temp ; holds STATUS during interrupt fsr_temp ; holds FSR during interrupt Dlay ; 8 Bit Delay Variable working ; working flag 0 not working, 1 working ptr ; used in displaying message Temp ; a temporary variable bin ; a temporary variable oset ; offset of time register oldtime ; holds last value of sec ENDC Here's my question - CBLOCK defines a block of constants starting at a given address. Problem is, 0CH isn't a valid address - or is it? If it is, why does it have a '0' in the lead position? 0xCH isn't valid as H is one too many for hex? I expect I'm being dumb but, can someone please point me to my mistake? Ted Mawson http://www.portfoliopm.com -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

> CBLOCK 0CH > sec ; seconds digit > oldtime ; holds last value of sec > ENDC > >Here's my question - CBLOCK defines a block of constants starting at a >given address. Problem is, 0CH isn't a valid address - or is it? If it You can use 0Ch just fine. The problem is that it's not the easiest to read. This could be written as 0x0C, 0x00C, 0x0Ch, etc. The compiler should pick up either variation. --Andrew _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Hey Ted, The zero ("0") is put before the hex character (in your example "C") because it indicates to the assembler that it is a constant value. Without the zero, the assembler would encounter the string "Ch", which it would assume is a label. When I'm doing PC assembly language, this one always bites me on the bum - It's easy to write "10h" (which will be correctly interpreted as 16 decimal) and then follow with "AAh" which is going to be initially interpreted as a label. This is why I prefer a definite type prefix like "0x0" or "$". myke {Original Message removed}

> > CBLOCK 0CH > > sec ; seconds digit > > sec10 ; 10's of second digit > > mins ; minutes digit > > min10 ; 10's of minutes digit > > > Problem is, 0CH isn't a valid address - or is it? 0x0c is the start of user RAM in the F84 or F628, hence where you'd expect variables to be assigned to -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

cblock asign a label to a addrr. given but writing 0ch means 0x0c the h on the first number is for hexa number as equal the 0xNUMBER but you not say what pic are using? --- Ted Mawson <spam_OUTTed.MawsonTakeThisOuTPORTFOLIOPM.COM> wrote: {Quote hidden}>I'm following the assembly code in worktime.asm to get me (back) up to >speed on assembly language. > > > >There's a bit where it goes. > > > >; Macro > >EStrobe MACRO ; Strobe the "E" Bit > bsf E > bcf E > ENDM > > CBLOCK 0CH > sec ; seconds digit > sec10 ; 10's of second digit > mins ; minutes digit > min10 ; 10's of minutes digit > hr ; hours digit > hr10 ; 10's of hours digit > highlim ; high limit + 1 of digit > w_temp ; holds W during interrupt > status_temp ; holds STATUS during interrupt > fsr_temp ; holds FSR during interrupt > Dlay ; 8 Bit Delay Variable > working ; working flag 0 not working, 1 working > ptr ; used in displaying message > Temp ; a temporary variable > bin ; a temporary variable > oset ; offset of time register > oldtime ; holds last value of sec > ENDC > > > >Here's my question - CBLOCK defines a block of constants starting at a >given address. Problem is, 0CH isn't a valid address - or is it? If it >is, why does it have a '0' in the lead position? 0xCH isn't valid as H >is one too many for hex? I expect I'm being dumb but, can someone >please point me to my mistake? > > > >Ted Mawson > >http://www.portfoliopm.com > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics _____________________________________________________________ Sign up for FREE email @ http://www.phat.co.nz and get your own @phat.co.nz address! muzic n' more @ http://www.muzic.net.nz -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.