Zilog Z08470 Uživatelský manuál stáhnout pdf (Strana 41)

100

101

UM008007-0715 Programming Task Examples

Z80 CPU

User Manual

SBC A, (HL) ;SUBTRACT (HL) FROM ACC

DAA ;ADJUST RESULT TO DECIMAL CODED VALUE

LD (HL), A ;STORE RESULT

INC HL ;ADVANCE MEMORY POINTERS

INC DE

DJNZ SUBDEC–$ ;DECREMENT B AND GO TO SUBDEC

;IF B

;NOT ZERO, OTHERWISE FALL

;THROUGH

Seventeen bytes are required for this operation.

Programming Task Examples

As indicated in Table 2, this example program sorts an array of numbers to ascending

order, using a standard exchange sorting algorithm. These numbers range from 0 to 255.

Table 2. Bubble Listing

Location

Object

Code Statement Source Statement

1 ; standard exchange (bubble) sort routine

3 ; at entry: hl contains address of data

c contains number of elements to be sorted

(1 < c < 256)

7 ; at exit data sorted in ascending order

9 ; use of

registers

10 ;

11 ; register contents

12 ;

13 ; a temporary storage for calculations

14 ; b counter for data array

15 ; c length of data array

16 ; d first element in comparison

17 ; e second element in comparison

18 ; h flag to indicate exchange

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 325 326

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