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HT82K96E Datasheet(PDF) 7 Page - Holtek Semiconductor Inc |
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HT82K96E Datasheet(HTML) 7 Page - Holtek Semiconductor Inc |
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7 / 44 page  HT82K96E Rev. 2.00 7 October 11, 2007 Program Memory - ROM The program memory is used to store the program in- structions which are to be executed. It also contains data, table, and interrupt entries, and is organized into 4096 ´15 bits, addressed by the program counter and ta- ble pointer. Certain locations in the program memory are reserved for special usage: · Location 000H This area is reserved for program initialization. After chip reset, the program always begins execution at lo- cation 000H. · Location 004H This area is reserved for the USB interrupt service program. If the USB interrupt is activated, the interrupt is enabled and the stack is not full, the program begins execution at location 004H. · Location 008H This area is reserved for the Timer/Event Counter 0 in- terrupt service program. If a timer interrupt results from a Timer/Event Counter 0 overflow, and if the in- terrupt is enabled and the stack is not full, the program begins execution at location 008H . · Location 00CH This location is reserved for the Timer/Event Counter 1 interrupt service program. If a timer interrupt results from a Timer/Event Counter 1 overflow, and the inter- rupt is enabled and the stack is not full, the program begins execution at location 00CH. · Table location Any location in the program memory can be used as look-up tables. The instructions ²TABRDC [m]² (the current page, one page=256 words) and ²TABRDL [m] ² (the last page) transfer the contents of the lower-order byte to the specified data memory, and the higher-order byte to TBLH (08H). Only the desti- nation of the lower-order byte in the table is well-defined, the other bits of the table word are trans- ferred to the lower portion of TBLH, and the remaining 1-bit words are read as ²0². The Table Higher-order byte register (TBLH) is read only. The table pointer (TBLP) is a read/write register (07H), which indicates the table location. Before accessing the table, the lo- cation must be placed in the TBLP. The TBLH is read only and cannot be restored. If the main routine and the ISR (Interrupt Service Routine) both employ the table read instruction, the contents of the TBLH in the main routine are likely to be changed by the table read instruction used in the ISR. Errors can occur. In other words, using the table read instruction in the main rou- tine and the ISR simultaneously should be avoided. However, if the table read instruction has to be applied in both the main routine and the ISR, the interrupt is supposed to be disabled prior to the table read in- struction. It will not be enabled until the TBLH has been backed up. All table related instructions require two cycles to complete the operation. These areas may function as normal program memory depending upon the requirements. Stack Register - STACK This is a special part of the memory which is used to save the contents of the program counter only. The stack is organized into 8 levels and is neither part of the data nor part of the program space, and is neither read- able nor writeable. The activated level is indexed by the stack pointer (SP) and is neither readable nor writeable. 1 5 b i t s F F F H n F F H P r o g r a m M e m o r y D e v i c e I n i t i a l i z a t i o n P r o g r a m U S B I n t e r r u p t S u b r o u t i n e T i m e r / E v e n t C o u n t e r 0 I n t e r r u p t S u b r o u t i n e L o o k - u p T a b l e ( 2 5 6 w o r d s ) L o o k - u p T a b l e ( 2 5 6 w o r d s ) N o t e : n r a n g e s f r o m 0 t o F 0 0 C H n 0 0 H 0 0 8 H 0 0 4 H 0 0 0 H T i m e r / E v e n t C o u n t e r 1 I n t e r r u p t S u b r o u t i n e Program Memory Instruction Table Location *11 *10 *9 *8 *7 *6 *5 *4 *3 *2 *1 *0 TABRDC [m] P11 P10 P9 P8 @7 @6 @5 @4 @3 @2 @1 @0 TABRDL [m] 1 1 1 1 @7 @6 @5 @4 @3 @2 @1 @0 Table Location Note: *11~*0: Table location bits P11~P8: Current program counter bits @7~@0: Table pointer bits |
Similar Part No. - HT82K96E_07 |
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Similar Description - HT82K96E_07 |
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