NEC PD750008 Manuale Utente

µPD750008 USER'S MANUAL

Function:  (mem) <– (mem)+1 ; Skip if (mem) = 0, mem = D

7-0

:  00H-FFH

Increments the data at the data memory location addressed by the 8-bit immediate data mem.  If the result

of increment produces data that is 0, the immediately following instruction is skipped.

Function:  reg <– reg–1 ; Skip if reg = FH

Decrements the contents of register reg (X, A, H, L, D, E, B, C).  If the result of decrement produces reg

= FH, the immediately following instruction is skipped.

Function:  rp’ <– rp’–1 ; Skip if rp’ = FFH

Decrements the contents of register pair rp’ (XA, HL, DE, BC, XA’, HL’, DE’, BC’).  If the result of decrement

produces rp’ = FFH, the immediately following instruction is skipped.

Function:  Skip if reg = n4     n4 = I

3-0

:  0-FH

Skips the immediately following instruction if the contents of register reg (X, A, H, L, D, E, B, C) match the

4-bit immediate data n4.

Function:  Skip if (HL) = n4     n4 = I

3-0

:  0-FH

Skips the immediately following instruction if the data at the data memory location addressed by the HL

register pair match the 4-bit immediate data n4.

Function:  Skip if A = (HL)

Skips the immediately following instruction if the contents of the A register match the data at the data memory

location addressed by the HL register pair.