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HT82K95E 数据表(PDF) 7 Page - Holtek Semiconductor Inc |
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HT82K95E 数据表(HTML) 7 Page - Holtek Semiconductor Inc |
7 / 42 page HT82K95E/HT82K95A Rev. 2.40 7 November 5, 2014 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. There are three method to read the ROM data by two table read instructions: ²TABRDC² and ²TABRDL², transfer the contents of the lower-order byte to the specified data memory, and the higher-order byte to TBLH (08H). The three methods are shown as follows: ¨ The instructions ²TABRDC [m]² (the current page, one page=256words), where the table locations is defined by TBLP (07H) in the current page. And the ROM code option TBHP is disabled (default). ¨ The instructions ²TABRDC [m]², where the table lo- cations is defined by registers TBLP (07H) and TBHP (01FH). And the ROM code option TBHP is enabled. ¨ The instructions ²TABRDL [m]², where the table lo- cations is defined by Registers TBLP (07H) in the last page (0F00H~0FFFH). Only the destination of the lower-order byte in the ta- ble is well-defined, the other bits of the table word are transferred to the lower portion of TBLH, and the re- maining 1-bit words are read as ²0². The Table Higher-order byte register (TBLH) is read only. The ta- ble pointer (TBLP, TBHP) is a read/write register (07H, 1FH), which indicates the table location. Before ac- cessing the table, the location must be placed in the TBLP and TBHP (If the OTP option TBHP is disabled, the value in TBHP has no effect). 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 should be disabled prior to the table read instruction. 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 when TBHP is disabled @7~@0: Table pointer bits TBHP register bit3~bit0 when TBHP is enabled |
类似零件编号 - HT82K95E_14 |
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类似说明 - HT82K95E_14 |
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