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HT82J30A Datasheet(PDF) 7 Page - Holtek Semiconductor Inc |
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HT82J30A Datasheet(HTML) 7 Page - Holtek Semiconductor Inc |
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7 / 47 page  HT82J30R/HT82J30A Rev. 1.00 7 December 20, 2006 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 4K ´15 bits, addressed by the program counter and table 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 external interrupt service program. If the INT0 input pin is activated, the inter- rupt 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 inter- rupt service program. If a timer interrupt results from a timer/event counter overflow, and if the interrupt is en- abled and the stack is not full, the program begins exe- cution at location 008H. · Location 00CH This location is reserved for the A/D converter inter- rupt service program. If the interrupt is activated, when the A/D conversion is completed, if the interrupt is enabled and the stack is not full, the program begins execution at this location. · Location 010H Location 010H is reserved for when 8 bits of data have been received or transmitted successfully from serial interface A. When the related interrupts are enabled, and the stack is not full, the program begins execution at location 010H. · Location 014H Location 014H is reserved for when 8 bits of data have been received or transmitted successfully from serial interface B. When the related interrupts are enabled, and the stack is not full, the program begins execution at location 014H. · Location 018H This location is reserved for the external interrupt ser- vice program. If the INT1 input pin is activated, the in- terrupt is enabled and the stack is not full, the program begins execution at this location. · Table location Any location in the Program Memory space can be used as a look-up table. The instructions ²TABRDC [m] ² (the current page, one page=256 words) and ²TABRDL [m]² (the last page) transfers the contents of the lower-order byte to the specified data memory, and the higher-order byte to the TBLH register. Only the destination 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. Any unused bits are read as ²0². The Table Higher-order byte register, TBLH, is read only. The table pointer, TBLP, is a read/write register, which indicates the table location. Before accessing the table, the location must be placed in TBLP. The TBLH register is read only and cannot be restored. If the main routine and the ISR (Interrupt Ser- vice Routine) both employ the table read instruction, the contents of TBLH in the main routine are likely to be changed by the table read instruction used in the ISR and errors can occur. In other words, using the table read instruction in the main routine and the ISR simul- taneously should be avoided. However, if the table N o t e : n r a n g e s f r o m 0 t o F 1 5 b i t s P r o g r a m M e m o r y 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 S u b r o u t i n e I N T 0 E x t e r n a l I n t e r r u p t S u b r o u t i n e 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 A / D C o n v e r t e r I n t e r r r u p t S u b r o u t i n e S P I _ A I n t e r r u p t S u b r o u t i n e S P I _ B I n t e r r u p t S u b r o u t i n e I N T 1 E x t e r n a l 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 ) 0 0 C H 0 0 8 H 0 0 4 H 0 0 0 H 0 1 0 H 0 1 4 H 0 1 8 H F F F H n F F H n 0 0 H 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] 1111 @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 |
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