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HT82M75R_1011 Datasheet(PDF) 11 Page - Holtek Semiconductor Inc |
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HT82M75R_1011 Datasheet(HTML) 11 Page - Holtek Semiconductor Inc |
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11 / 66 page  HT82M75R/HT82M75RE HT82K75R/HT82K75RE Rev. 1.30 11 November 24, 2010 tempreg1 db ? ; temporary register #1 tempreg2 db ? ; 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 ²F06H² 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 ²F05H² 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 F00h ; sets initial address of last page dc 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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