HT82K74E datasheet(11/56 Pages) HOLTEK

11 / 56 page

HT82K74E/HT82K74EE

Rev. 1.00

December 15, 2009

tempreg1

; temporary register #1

tempreg2

; temporary register #2

mov

a,06h

; initialise table pointer - note that this address

; is referenced

mov

tblp,a

; to the last page or present page

tabrdl

tempreg1

; transfers value in table referenced by table pointer

; to tempregl

; data at prog. memory address

²706H² transferred to

; tempreg1 and TBLH

dec

tblp

; reduce value of table pointer by one

tabrdl

tempreg2

; transfers value in table referenced by table pointer

; to tempreg2

; data at prog.memory address

²705H² transferred to

; tempreg2 and TBLH

; in this example the data

²1AH² is transferred to

; tempreg1 and data

²0FH² to register tempreg2

; the value

²00H² will be transferred to the high byte

; register TBLH

org

700h

; sets initial address of last page

00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh

Because the TBLH register is a read-only register and cannot be restored, care should be taken to ensure its protection

if both the main routine and Interrupt Service Routine use the table read instructions. If using the table read instructions,

the Interrupt Service Routines may change the value of TBLH and subsequently cause errors if used again by the main

routine. As a rule it is recommended that simultaneous use of the table read instructions should be avoided. However,

in situations where simultaneous use cannot be avoided, the interrupts should be disabled prior to the execution of any

main routine table-read instructions. Note that all table related instructions require two instruction cycles to complete

their operation.

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