Instruction: Set a register's destination field to a value.

MOVD Destination, < # >Value

Result: Value is stored in Destination's d-field (bits 17..9).

Destination (d-field) is the register whose destination field (bits 17..9) is set to Value's value.
Value (s-field) is a register or a 9-bit literal whose value is stored into Destination's d-field.

Opcode Table:

–INSTR– ZCRI –CON– –DEST– –SRC–	Z Result	C Result	Result	Clocks
010101 001i 1111 ddddddddd sssssssss	Result = 0	—	Written	4

Concise Truth Table:

In					Out
Destination	Source	Z	C	Effects	Destination	Z	C
$0000_0000; 0	$0000_0000; 0	-	-	wz wc	$0000_0000; 0	1	0
$0000_0000; 0	$0000_01FF; 511	-	-	wz wc	$0003_FE00; 261,632	0	1
$FFFF_FFFF; -1	$0000_01FF; 511	-	-	wz wc	$FFFF_FFFF; -1	0	0
$FFFF_FFFF; -1	$0000_0000; 0	-	-	wz wc	$FFFC_01FF; -261,633	0	0

Explanation

MOVD copies the 9-bit value of Value into Destination's d-field (destination field) bits 17..9. Destination's other bits are left unchanged. This instruction is handy for setting certain registers like CTRA and VCFG, and for updating the destination field of instructions in self-modifying code.

For self-modifying code, ensure that at least one other instruction is executed between a MOVD instruction and the target instruction that MOVD modifies. This gives the cog time to write MOVD's result before it fetches the target instruction for execution; otherwise, the as-yet-unmodified version of the target instruction would be fetched and executed.

If the WZ effect is specified, the Z flag is set (1) if Value equals zero. The result is written to Destination unless the NR effect is specified.