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HT83F60P Datasheet(PDF) 9 Page - Holtek Semiconductor Inc |
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HT83F60P Datasheet(HTML) 9 Page - Holtek Semiconductor Inc |
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9 / 62 page  HT83FXX Rev. 1.10 9 January 21, 2010 However, when the stack is full, a CALL subroutine in- struction can still be executed which will result in a stack overflow. Precautions should be taken to avoid such cases which might cause unpredictable program branching. 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. By using the appropriate pro- gramming tools, this Program memory device offer us- ers the flexibility to conveniently debug and develop their applications while also offering a means of field programming. Structure The program memory stores the program instructions that are to be executed. It also includes data, table and interrupt entries, addressed by the Program Counter along with the table pointer. The program memory size is 2K ´15 bits. Certain locations in the program memory are reserved for special usage. 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 goes low, the pro- gram will jump to this location and begin execution if the external interrupt is enabled and the stack is not full. · Location 008H This vector is used by the 8-bit Timer 0. If a overflow occurs, the program will jump to this location and be- gin execution if the timer interrupt is enabled and the stack is not full. · Location 00CH This vector is used by the 8-bit Timer1. If a overflow occurs, the program will jump to this location and be- gin execution if the timer interrupt is enabled and the stack is not full. · Location 010H Reserved. · Location 014H This vector is used by the SIM Bus interrupt service program. If the SIM Bus interrupt resulting from a slave address is matched or if 8 bits of data have been received or transmitted successfully from the I 2C inter- face, or 8 bits of data have been received or transmit- ted successful from SPI interface, the program will jump to this location and begin execution if the inter- rupt is enabled and the stack is not full. 7 F F H 1 5 b i t s 0 1 5 H 0 0 0 H 0 0 4 H 0 0 8 H 0 0 C H 0 1 0 H I n i t i a l i s a t i o n V e c t o r T i m e B a s e I n t e r r u p t V e c t o r T i m e r C o u n t e r 0 I n t e r r u p t V e c t o r 0 1 4 H T i m e r C o u n t e r 1 I n t e r r u p t V e c t o r S I M I n t e r r u p t V e c t o r Program Memory Structure |
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