POP's setting of C and Z flags, I'd like it changed. Anyone use it?

evanh

Appreciated Chip.

__red__

Just to confirm, but after an interrupt routine is called C&Z still get stored and restored with the old PC right?

ozpropdev

__red__ wrote: »

Just to confirm, but after an interrupt routine is called C&Z still get stored and restored with the old PC right?

Correct

__red__

Awesome, thanks for your patience.

evanh

Ha, that's cool. ISR return is just an alias of the linking instruction. And it has wcz encoded.

TonyB_

deleted

ozpropdev

Opcodes check out Ok in Pnut

dat	org

	pusha	0
	pushb	0
	popa	0
	popb	0
{
00000- 61 01 64 FC E1 01 64 FC 5F 01 04 FB DF 01 04 FB   'a.d...d._.......'

'61 01 64 FC
1111 1100011 001 000000000 101100001	'PUSHA 0

 E1 01 64 FC
1111 1100011 001 000000000 111100001	'PUSHB	0

 5F 01 04 FB
1111 1011000 001 000000000 101011111	'POPA 	0

 DF 01 04 FB
1111 1011000 001 000000000 111011111	'POPB	0

EEEE 1100011 0L1 DDDDDDDDD 101100001 PUSHA   {#}D
EEEE 1100011 0L1 DDDDDDDDD 111100001 PUSHB   {#}D

EEEE 1011000 CZ1 DDDDDDDDD 101011111 POPA    D
EEEE 1011000 CZ1 DDDDDDDDD 111011111 POPB    D

evanh

Oh, I see. The main doc explains things. Note the ++ on push, and -- on pop:

EEEE 1100011 0L1 DDDDDDDDD 101100001	PUSHA   {#}D	Write long in D[31:0] to hub address PTRA++.
EEEE 1100011 0L1 DDDDDDDDD 111100001	PUSHB   {#}D	Write long in D[31:0] to hub address PTRB++.

EEEE 1011000 CZ1 DDDDDDDDD 101011111	POPA    D        {WC/WZ/WCZ}	Read long from hub address --PTRA into D. C = MSB of long. *
EEEE 1011000 CZ1 DDDDDDDDD 111011111	POPB    D        {WC/WZ/WCZ}	Read long from hub address --PTRB into D. C = MSB of long. *