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HT46R92 Datasheet(PDF) 9 Page - Holtek Semiconductor Inc |
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HT46R92 Datasheet(HTML) 9 Page - Holtek Semiconductor Inc |
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9 / 61 page  HT46R92 Rev. 1.10 9 November 5, 2008 Arithmetic and Logic Unit - ALU The arithmetic-logic unit or ALU is a critical area of the microcontroller that carries out arithmetic and logic op- erations of the instruction set. Connected to the main microcontroller data bus, the ALU receives related in- struction codes and performs the required arithmetic or logical operations after which the result will be placed in the specified register. As these ALU calculation or oper- ations may result in carry, borrow or other status changes, the status register will be correspondingly up- dated to reflect these changes. The ALU supports the following functions: · Arithmetic operations: ADD, ADDM, ADC, ADCM, SUB, SUBM, SBC, SBCM, DAA · Logic operations: AND, OR, XOR, ANDM, ORM, XORM, CPL, CPLA · Rotation RRA, RR, RRCA, RRC, RLA, RL, RLCA, RLC · Increment and Decrement INCA, INC, DECA, DEC · Branch decision, JMP, SZ, SZA, SNZ, SIZ, SDZ, SIZA, SDZA, CALL, RET, RETI Program Memory The Program Memory is the location where the user code or program is stored. For this device, the type of memory is One-Time Programmable, OTP, memory where users can program their application code into the device. By us- ing the appropriate programming tools, OTP devices of- fer users the flexibility to freely develop their applications which may be useful during debug or for products requir- ing frequent upgrades or program changes. OTP devices are also applicable for use in applications that require low or medium volume production runs. Structure The Program Memory has a capacity of 2K by 14 bits. The Program Memory is addressed by the Program Counter and also contains data, table information and interrupt entries. Table data, which can be setup in any location within the Program Memory, is addressed by separate table pointer registers. Special Vectors Within the Program Memory, certain locations are re- served for special usage such as reset and interrupts. · Location 000H This vector is reserved for use by the device reset for program initialisation. After a device reset is initiated, the program will jump to this location and begin execution. · Location 004H This vector is used by the external interrupt. If the ex- ternal interrupt pin on the device receives a rising or falling transition, the program will jump to this location and begin execution if the external interrupt is enabled and the stack is not full. · Location 008H This internal vector is used by the Timer/Event Coun- ter 0. If a counter overflow occurs, the program will jump to this location and begin execution if the timer/event counter interrupt is enabled and the stack is not full. · Location 00CH This internal vector is used by the Time Base interrupt. If a Time Base interrupt occurs, the program will jump to this location and begin execution if the time base in- terrupt is enabled and the stack is not full. · Location 010H This internal vector is used by the A/D converter. When an A/D conversion cycle is complete, the pro- gram will jump to this location and begin execution if the A/D 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. 7 F F H 1 4 b i t s I n i t i a l i s a t i o n V e c t o r E x t e r n a l I n t e r r u p t V e c t o r 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 V e c t o r A / D C o n v e r t e r I n t e r r u p t V e c t o r 0 0 0 H 0 0 4 H 0 0 8 H 0 0 C H 0 1 0 H T i m e B a s e I n t e r r u p t V e c t o r Program Memory Structure |
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