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HT48F30E Datasheet(PDF) 11 Page - Holtek Semiconductor Inc |
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HT48F30E Datasheet(HTML) 11 Page - Holtek Semiconductor Inc |
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11 / 74 page  HT48F06E/HT48F10E/HT48F30E Rev. 1.60 11 July 29, 2009 · Location 008H This internal vector is used by the Timer/Event Coun- ter. If a counter overflow occurs, the program will jump to this location and begin execution if the timer/event counter interrupt is enabled and the stack is not full. Look-up Table Any location within the Program Memory can be defined as a look-up table where programmers can store fixed data. To use the look-up table, the table pointer must first be setup by placing the lower order address of the look up data to be retrieved in the table pointer register, TBLP. This register defines the lower 8-bit address of the look-up table. After setting up the table pointer, the table data can be retrieved from the current Program Memory page or last Program Memory page using the ²TABRDC[m]² or ²TABRDL [m]² instructions, respectively. When these in- structions are executed, the lower order table byte from the Program Memory will be transferred to the user de- fined Data Memory register [m] as specified in the in- struction. The higher order table data byte from the Program Memory will be transferred to the TBLH special register. Any unused bits in this transferred higher order byte will have uncertain values. The following diagram illustrates the addressing/data flow of the look-up table: Table Program Example The following example shows how the table pointer and table data is defined and retrieved from the HT48F06E or HT48F10E devices. This example uses raw table data located in the last page which is stored there using the ORG statement. The value at this ORG statement is ²300H² which refers to the start address of the last page within the 1K Program Memory of the microcontroller. The table pointer is setup here to have an initial value of ²06H². This will ensure that the first data read from the data table will be at the Program Memory address ²306H² or 6 locations after the start of the last page. Note that the value for the table pointer is referenced to the first address of the present page if the ²TABRDC [m] ² instruction is being used. The high byte of the table data which in this case is equal to zero will be trans- ferred to the TBLH register automatically when the ²TABRDL [m]² instruction is executed. P r o g r a m M e m o r y P r o g r a m C o u n t e r H i g h B y t e T B L P T B L H S p e c i f i e d b y [ m ] H i g h B y t e o f T a b l e C o n t e n t s L o w B y t e o f T a b l e C o n t e n t s Look-up Table 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 ²306H² 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 ²305H² transferred to ; tempreg2 and TBLH ; in this example the data ²1AH² is transferred to ; tempreg1 and data ²0FH² to register tempreg2 : : org 300h ; sets initial address of HT48F06E or HT48F10E last page dc 00Ah, 00Bh, 00Ch, 00Dh, 00Eh, 00Fh, 01Ah, 01Bh : : |
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