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User’s Manual 249
Symbols
Rabbit Z180 Meaning
b b
Bit select:
000 = bit 0, 001 = bit 1,
010 = bit 2, 011 = bit 3,
100 = bit 4, 101 = bit 5,
110 = bit 6, 111 = bit 7
cc cc
Condition code select:
00 = NZ, 01 = Z,
10 = NC, 11 = C
d d
7-bit (signed) displacement. Expressed in two’s complement.
dd ww
Word register select destination: 00 = BC, 01 = DE, 10 = HL, 11 = SP
dd’
Word register select alternate: 00 = BC’, 01 = DE’, 10 = HL’
e j
8-bit (signed) displacement added to PC.
f f
Condition code select:
000 = NZ (non zero),001 = Z (zero),
010 = NC (non carry), 011 = C (carry),
100 = LZ
*
(logical zero), 101 = LO
†
(logical one),
110 = P (sign plus), 111 = M (sign minus)
* Logical zero if all four of the most significant bits of the result are 0.
† Logical one if any of the four most significant bits of the result are 1.
m m
MSB of a 16-bit constant.
mn mn
16-bit constant.
n n
8-bit constant or LSB of a 16-bit constant.
r, g g, g’
Byte register select:
000 = B, 001 = C,
010 = D, 011 = E,
100 = H, 101 = L,
111 = A
ss ww
Word register select (source): 00 = BC, 01 = DE, 10 = HL, 11 = SP
v v
Restart address select:
010 = 0x0020, 011 = 0x0030,
100 = 0x0040, 101 = 0x0050,
111 = 0x0070
xx xx
Word register select: 00 = BC, 01 = DE, 10 = IX, 11 = SP
yy yy
Word register select: 00 = BC, 01 = DE, 10 = IY, 11 = SP
zz zz
Word register select: 00 = BC, 01 = DE, 10 = HL, 11 = AF