0 + 0 = 0   Z=1, N=0, C=0

0 + 1 = 1   Z=0, N=0, C=0
0b00000000 + 0b00000001 = 0b000000001

0x80 + 0x80 = 0x100   Z=1, N=0, C=1
0b10000000 + 0b10000000 = 0b100000000

0xff + 0x01 = 0x100   Z=1, N=0, C=1
0b11111111 + 0b00000001 = 0b100000000

0x80 + 0x00 = 0x80    Z=0, N=1, C=0
0b10000000 + 0b00000000 = 0b010000000

0xc0 + 0xc0 = 0x180   Z=0, N=1, C=1
0b11000000 + 0b11000000 = 0b110000000

bit 7 is N
bit 8 is C
iff bit 0 to bit 7 are zeros, Z=1
iff any of bit 0 to bit 7 is nonzero, Z=0

0xc5 + 0xcc = 0x191

0xb4c5 + 0x29cc = 0xde91