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git-svn-id: https://svn.code.sf.net/p/acme-crossass/code-0/trunk@263 4df02467-bbd4-4a76-a152-e7ce94205b78
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marcobaye 2020-06-28 00:30:43 +00:00
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docs/cputypes/cpu 65816.txt
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@ -102,39 +102,50 @@ of the 65c02. Among the improvements are:
New mnemonics New mnemonics
------------- -------------
02 cop imm8 02 cop imm8 coprocessor operation
6b rtl 6b rtl return long (fetches 24-bit address from stack)
82 brl rel16 82 brl rel16 branch long (16-bit offset)
0b phd 0b phd push direct page register
2b pld 4b phk push program bank register
4b phk 8b phb push data bank register
62 per rel16 62 per rel16 push effective relative address
8b phb d4 pei (dp) push effective indirect address
ab plb f4 pea abs16 push effective absolute address
d4 pei (dp)
f4 pea abs16
1b tcs 2b pld pull direct page register
3b tsc ab plb pull data bank register
5b tcd
7b tdc
9b txy
bb tyx
eb xba 1b tcs transfer C to stack pointer
fb xce 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 c2 rep #imm8 clear bits in status register
54 mvn src, dst e2 sep #imm8 set bits in status register
c2 rep #imm8 cb wai wait for interrupt
e2 sep #imm8 db stp wait for reset
cb wai 42 wdm (reserved for future expansion)
db stp
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 New addressing modes for existing mnemonics
------------------------------------------- -------------------------------------------