6502/acme
1
0
Fork 0
mirror of https://github.com/uffejakobsen/acme.git synced 2024-11-25 07:31:52 +00:00
Code Issues Projects Releases Wiki Activity

docs only

Browse Source 
git-svn-id: https://svn.code.sf.net/p/acme-crossass/code-0/trunk@263 4df02467-bbd4-4a76-a152-e7ce94205b78
This commit is contained in:
marcobaye 2020-06-28 00:30:43 +00:00
parent 9d637eee25
commit 8f432f6aa7
1 changed files with 37 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
docs/cputypes/cpu 65816.txt
View File

@ -102,39 +102,50 @@ of the 65c02. Among the improvements are:
New mnemonics
-------------
02 cop imm8
6b rtl
82 brl rel16
02 cop imm8 coprocessor operation
6b rtl return long (fetches 24-bit address from stack)
82 brl rel16 branch long (16-bit offset)
0b phd
2b pld
4b phk
62 per rel16
8b phb
ab plb
d4 pei (dp)
f4 pea abs16
0b phd push direct page register
4b phk push program bank register
8b phb push data bank register
62 per rel16 push effective relative address
d4 pei (dp) push effective indirect address
f4 pea abs16 push effective absolute address
1b tcs
3b tsc
5b tcd
7b tdc
9b txy
bb tyx
2b pld pull direct page register
ab plb pull data bank register
eb xba
fb xce
1b tcs transfer C to stack pointer
3b tsc transfer stack pointer to C
5b tcd transfer C to direct page register
7b tdc transfer direct page register to C
('C' means the whole 16-bit accumulator, even in 8-bit mode)
9b txy transfer X to Y
bb tyx transfer Y to X
42 wdm
eb xba exchange high and low bytes of accumulator
fb xce exchange Carry and Emulation bits
44 mvp src, dst
54 mvn src, dst
c2 rep #imm8 clear bits in status register
e2 sep #imm8 set bits in status register
c2 rep #imm8
e2 sep #imm8
cb wai wait for interrupt
db stp wait for reset
cb wai
db stp
42 wdm (reserved for future expansion)
block transfers:
44 mvp src, dst move previous (decrementing addresses)
54 mvn src, dst move next (incrementing addresses)
the arguments are bank numbers. block size minus one must be in 16-bit
accumulator. X holds source address, Y holds target address.
after these instructions, data bank register is set to "dst".
if blocks overlap:
when moving a block to a higher address, use mvp and put the highest
addresses in X/Y.
when moving a block to a lower address, use mvn and put the lowest
adresses in X/Y.
New addressing modes for existing mnemonics
-------------------------------------------