NEC PD750008 Manuale Utente

Function:  CY <– (bit specified in operand)

Transfers the data memory bit specified by bit manipulation addressing (fmem.bit, pmem.@L, @H+mem.bit)

to the carry flag (CY).

Function:  (bit specified in operand) <– CY

Transfers the carry flag (CY) bit to the data memory bit specified by bit manipulation addressing (fmem.bit,

pmem.@L,@H+mem.bit)

Example The flag (bit 3 at address 3FH) in data memory is set in bit 2 of port 3.

FLAG EQU 3FH.3

SEL

MB0

MOV

H,#FLAG SHR6

; H <– high-order 4 bits of FLAG

MOV1 CY,@H+FLAG

; CY <– FLAG

MOV1 PORT3.2,CY

; P32 <– CY

Function:  A <– A+n4 ; Skip if carry.     n4 = I

3-0

:  0-FH

Adds the 4-bit immediate data n4 to the contents of the A register in binary, then skips the next instruction

if the addition generates a carry.  The carry flag is not affected.

This instruction, when combined with the ADDC A,@HL or SUBC A,@HL instruction, functions as a number

system conversion instruction.  (See Section 11.1.)