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HT82A623R Datasheet(PDF) 10 Page - Holtek Semiconductor Inc |
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HT82A623R Datasheet(HTML) 10 Page - Holtek Semiconductor Inc |
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10 / 98 page  HT82A623R/HT82A6208/HT82A6216 Rev.1.30 10 January14,2011 If the stack is full and an enabled interrupt takes place, the interrupt request flag will be recorded but the ac- knowledge signal will be inhibited. When the Stack Pointer is decremented, by RET or RETI, the interrupt will be serviced. This feature prevents stack overflow al- lowing the programmer to use the structure more easily. 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. ArithmeticandLogicUnit - 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 followingfunctions: · 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 · IncrementandDecrementINCA,INC, DECA,DEC · Branch decision, JMP, SZ, SZA, SNZ, SIZ, SDZ, SIZA, SDZA,CALL,RET, RETI ProgramMemory The Program Memory is the location where the user code or program is stored. The HT82A623R is a One-Time Programmable, OTP, memory type device 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 4K by 15 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 separatetablepointerregisters. SpecialVectors Within the Program Memory, certain locations are re- servedforspecialusagesuchasresetandinterrupts. · Location000H 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. · Location004H 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 will jumptothislocationandbeginexecution. · Location008H This vector is used by the external interrupt. If the INT external input pin on the device receives a high to low transition, the program will jump to this location and begin execution, if the interrupt is enabled and the stackisnotfull. · Location00CH This vector is used by the timer0 counter. If a counter overflow occurs, the program will jump to this location and begin execution if the timer interrupt is enabled andthestackisnotfull. · Location010H This vector is used by serial interface A . When 8-bits of data have been received or transmitted success- fully from serial interface A, the program will jump to this location and begin execution if the interrupt is en- abledandthestackisnotfull. · Location014H This vector is used by serial interface B . When 8-bits of data have been received or transmitted success- fully from serial interface A, the program will jump to this location and begin execution if the interrupt is en- abledandthestackisnotfull F F F H 1 5 b i t s 0 1 4 H 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 0 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 S P I A I n t e r r u p t V e c t o r S P I B I n t e r r u p t V e c t o r 0 1 8 H T im e r / E v e n t C o u n t e r 1 I n t e r r u p t V e c t o r U S B I n t e r r u p t V e c t o r ProgramMemoryStructure |
Similar Part No. - HT82A623R_11 |
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Similar Description - HT82A623R_11 |
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