P2223 inst encoding

	A	B	C	D	E	F	G	H	I	J	K
1		31-28	27-24	23-20	19-16	15-12	11-8	7-4	3-0
2
3	ALU	cond	000 0	Rd	op	----	Rb	----	----	ALU Rd,Rb	2op, reg
4		cond	000 1	Rd	op	#16	#16	#16	#16	ALU Rd,#16	2op, #
5		cond	001 -	Rd	op	----	----	----	----	ALU Rd	1op
6
7	CALL	cond	010 0	u24	u24	u24	u24	u24	u24	CALL abs(u24)
8		cond	010 1	Rd	s20	s20	s20	s20	s20	CALL Rd,s20
9
10	LD/ST	cond	100 W	Rd	Ra	UP--	Rb	----	----	ST Rd,+-Ra+-,Rb
11		cond	101 W	Rd	Ra	UP--	Rb	----	----	LD Rd,+-Ra+-,Rb
12		cond	110 W	Rd	Ra	s16	s16	s16	s16	ST Rd,*Ra,s16
13		cond	111 W	Rd	Ra	s16	s16	s16	s16	LD Rd,*Ra,s16	!U,!P
14
15	EXT	cond	011 L	Rd	0000	u16	u16	u16	u16	LD/ST Rd,direct
16		cond	011 P	Rd	0001	0ES-	Rb	----	Ri	PUTB/GETB{SZ} Rd,Rb,Ri
17		cond	011 P	Rd	0001	1ES-	Rb	----	--u2	PUTB/GETB{SZ} Rd,Rb,u2
18		cond	011 W	Rd	0010	----	Rb	----	----	RDS/WRS Rd,Rb
19
20		W=0 no write-back				U=0 Down: Ra= Ra-1			P=0 Post: change Ra after use
21		W=1 write-back Ra with +/-1 value				U=1 Up: Ra= Ra+1			P=1 Pre: change Ra before use
22
23			op		ALU R	ALU #	ALU 1op		Flags
24		0 always	0	W-[----]	MOV	MVL #u16 W-	ZEB	W-[----]	UP OZCS
25	op1 == op2	1 EQ	1	--[----]		MVH #u16 W-	ZEW	W-[----]	01 S Sign
26	op1 != op2	2 NE	2	--[----]		MVZL #u16 W-	SEB	W-[----]	02 C Carry/Borrow
27	u1 >= u2	3 CS, HS	3	W-[----]	SED	MVS #s16 W-	SEW	W-[----]	04 Z Zero
28	u1 < u2	4 CC, LO	4	WF[OZCS]	ADD	ADD #s16	NOT	WF[-Z-S]	08 O Overflow
29	S==1	5 MI	5	WF[OZCS]	ADC	ADC #s16	NEG	WF[OZCS]	10 P Pre/Post for LD/ST #offset
30	S==0	6 PL	6	WF[OZCS]	SUB	SUB #s16	ROR	WF[-ZCS]	20 U Up/Down for LD/ST #offset
31	O==1	7 VS	7	WF[OZCS]	SBB	SBB #s16	ROL	WF[-ZCS]
32	O==0	8 VC	8	-F[OZCS]	CMP	CMP #s16	SHL	WF[-ZCS]
33	u1 > u2	9 HI	9	WF[-Z-S]	MUL	MUL #s16	SHR	WF[-ZCS]
34	u1 <= u2	10 LS	10	W-[----]	PLUS	PLUS #s16	SHA	WF[-ZCS]
35	s1 >= s2	11 GE	11	WF[-Z-S]	BTST	BTST #u16	SZ	-F[-Z-S]
36	s1 < s2	12 LT	12	-F[-Z-S]	TEST	TEST #u16	SEC	-F[--C-]
37	s1 > s2	13 GT	13	WF[-Z-S]	OR	OR #u16	CLC	-F[--C-]
38	s1 <= s2	14 LE	14	WF[-Z-S]	XOR	XOR #u16	GETF	W-[----]
39		15 uncond	15	WF[-Z-S]	AND	AND #o16	SETF	-F[OZCS]
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