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HT56R22 датащи(PDF) 20 Page - Holtek Semiconductor Inc |
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HT56R22 датащи(HTML) 20 Page - Holtek Semiconductor Inc |
20 / 127 page HT56R22/HT56R23/HT56R24/HT56R25/HT56R26 Rev. 1.30 20 December 26, 2014 · Multifunction Interrupt vector The Multi-function Interrupt vector is shared by sev- eral internal functions such as a Time Base overflow, a Real Time Clock overflow, an A/D converter conver- sion completion, a falling edge appearing on the Ex- ternal Peripheral interrupt pin, a Timer/Event Counter 2 or a Timer/Event Counter 3 overflow, a SPI data transfer completion. The program will jump to this lo- cation and begin execution if the relevant 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 be read as ²0². The following diagram illustrates the addressing/data flow of the look-up table: Table Program Example The accompanying example shows how the table pointer and table data is defined and retrieved from the device. This example uses raw table data located in the last page which is stored there using the ORG state- ment. 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 HT56R22 microcontrollers. 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 trans- ferred to the TBLH register automatically when the ²TABRDL [m]² instruction is executed. 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 er- rors if used again by the main routine. As a rule it is rec- ommended that simultaneous use of the table read instructions should be avoided. However, in situations where simultaneous use cannot be avoided, the inter- rupts 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. Instruction Table Location Bits b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 TABRDC [m] PC14 PC13 PC12 PC11 PC10 PC9 PC8 @7 @6 @5 @4 @3 @2 @1 @0 Table Location Note: PC14~PC8: Current Program Counter bits @7~@0: Table Pointer TBLP bits For the HT56R22, the Table address location is 11 bits, i.e. from b10~b0. For the HT56R23, the Table address location is 12 bits, i.e. from b11~b0. For the HT56R24, the Table address location is 13 bits, i.e. from b12~b0. For the HT56R25, the Table address location is 14 bits, i.e. from b13~b0. For the HT56R26, the Table address location is 15 bits, i.e. from b14~b0. R e g i s t e r T B L H U s e r S e l e c t e d R e g i s t e r H i g h B y t e L o w B y t e L a s t p a g e o r p r e s e n t p a g e P C x ~ P C 8 P C H i g h B y t e T B L P R e g i s t e r D a t a 1 4 ~ 1 6 b i t s P r o g r a m M e m o r y |
Аналогичный номер детали - HT56R22_14 |
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Аналогичное описание - HT56R22_14 |
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