Holtek BS66F340 - Page 59

Rev. 1.60 58 August 20, 2019 Rev. 1.60 59 August 20, 2019
BS66F340/BS66F350/BS66F360/BS66F370
Touch A/D Flash MCU with LED Driver
BS66F340/BS66F350/BS66F360/BS66F370
Touch A/D Flash MCU with LED Driver
Example 2
data .section ‘data’
adres1 db ?
adres2 db ?
adres3 db ?
adres4 db ?
block db ?
code .section at 0 ‘code’
org 00h
start:
mov a,04h ; setup size of block
mov block,a
mov a,01h ; setup the memory sector
mov mp1h,a
mov a,offset adres1 ; Accumulator loaded with rst RAM address
mov mp1l,a ; setup memory pointer with rst RAM address
loop:
clr IAR1 ; clear the data at address dened by MP1
inc mp1l ; increment memory pointer MP1L
sdz block ; check if last memory location has been cleared
jmp loop
continue:
:
The important point to note here is that in the example shown above, no reference is made to specic
RAM addresses.
Direct Addressing Program Example using extended instructions
data .section ‘data’
temp db ?
code .section at 0 code
org 00h
start:
lmov a,[m] ; move [m] data to acc
lsub a, [m+1] ; compare [m] and [m+1] data
snz c ; [m]>[m+1]?
jmp continue ; no
lmov a,[m] ; yes, exchange [m] and [m+1] data
mov temp,a
lmov a,[m+1]
lm ov [m],a
mov a,temp
lmov [m+1],a
continue:
:
Note: Here "m" is a data memory address located in any data memory sectors. For example,
m=1F0H, it indicates address 0F0H in Sector 1.