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HT48CA0 Datasheet(PDF) 9 Page - Holtek Semiconductor Inc |
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HT48CA0 Datasheet(HTML) 9 Page - Holtek Semiconductor Inc |
9 / 36 page Instruction(s) Table Location *9 *8 *7 *6 *5 *4 *3 *2 *1 *0 TABRDC [m] P9 P8 @7 @6 @5 @4 @3 @2 @1 @0 TABRDL [m] 1 1 @7 @6 @5 @4 @3 @2 @1 @0 Table location Notes: *9~*0: Table location bits @7~@0: Table pointer bits P9~P8: Current program counter bits The special function registers include the indirect addressing register (00H), the memory pointer register (MP;01H), the accumulator (ACC;05H) the program counter lower-order byte register (PCL;06H), the table pointer (TBLP;07H), the ta- ble higher-order byte register (TBLH;08H), the status register (STATUS;0AH) and the I/O regis- ters (PA;12H, PB;14H, PC;16H). The remaining space before the 20H is reserved for future ex- panded usage and reading these locations will return the result 00H. The general purpose data memory, addressed from 20H to 3FH, is used for data and control information under instruction command. All data memory areas can handle arithmetic, logic, increment, decrement and rotate opera- tions directly. Except for some dedicated bits, each bit in the data memory can be set and reset by the SET [m].i and CLR [m].i instructions, respectively. They are also indirectly accessible through memory pointer register (MP;01H). Indirect addressing register Location 00H is an indirect addressing register that is not physically implemented. Any read/write operation of [00H] accesses data memory pointed to by MP (01H). Reading loca- tion 00H itself indirectly will return the result 00H. Writing indirectly results in no operation. The memory pointer register MP (01H) is a 6-bit register. The bit 7~6 of MP is undefined and reading will return the result “1”. Any writing operation to MP will only transfer the lower 6-bit data to MP. RAM mapping HT48CA0 9 23rd July ’98 |
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