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HT46R48A Datasheet(PDF) 11 Page - Holtek Semiconductor Inc |
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HT46R48A Datasheet(HTML) 11 Page - Holtek Semiconductor Inc |
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11 / 77 page  HT46R46/C46/R47/C47/R48A/C48A/R49 Rev. 1.30 11 June 5, 2008 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 be read as ²0². 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 HT46R47 microcontroller. This example uses raw table data lo- cated in the last page which is stored there using the ORG statement. The value at this ORG statement is ²700H² which refers to the start address of the last page within the 2K Program Memory of the HT46R47 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 ²706H² 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 transferred to the TBLH register automatically when the ²TABRDL [m]² instruction is executed. 3 F F H N o t I m p l e m e n t e d 1 5 b i t s 1 4 b i t s 1 4 b i t s 8 0 0 H F F F H 0 1 4 H I n i t i a l i s a t i o n V e c t o r E x t e r n a l I n t e r r u p t V e c t o r I n i t i a l i s a t i o n V e c t o r E x t e r n a l I n t e r r u p t V e c t o r T i m e r / E v e n t C o u n t e r I n t e r r u p t V e c t o r I n i t i a l i s a t i o n V e c t o r E x t e r n a l I n t e r r u p t V e c t o r T i m e r / E v e n t C o u n t e r I n t e r r u p t V e c t o r H T 4 6 R 4 7 H T 4 6 R 4 8 A H T 4 6 R 4 9 H T 4 6 R 4 6 A / D C o n v e r t e r I n t e r r u p t V e c t o r A / D C o n v e r t e r I n t e r r u p t V e c t o r A / D C o n v e r t e r I n t e r r u p t V e c t o r T i m e r / E v e n t C o u n t e r I n t e r r u p t V e c t o r 0 0 0 H 0 0 4 H 0 0 8 H 0 0 C H 0 1 0 H 3 0 0 H 7 F F H 4 0 0 H Program Memory Structure 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 ] T a b l e C o n t e n t s H i g h B y t e T a b l e C o n t e n t s L o w B y t e |
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