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HT82K68E Datasheet(PDF) 10 Page - Holtek Semiconductor Inc |
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HT82K68E Datasheet(HTML) 10 Page - Holtek Semiconductor Inc |
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10 / 40 page  HT82K68E 10 August 8, 2000 Preliminary (STATUS;0AH), the Interrupt Control register (INTC;0BH), the timer counter register (TMR;0DH), the timer counter control register (TMRC;0EH), the I/O registers (PA;12H, PB;14H, PC;16H, PD;18H, PE;1AH) and the I/O control registers (PAC;13H, PBC;15H, PCC;17H, PDC;19H, PEC;1BH). The remaining space be- fore the 60H is reserved for future expanded us- age and reading these locations will get the result 00H. The general purpose data memory, ad- dressed from 60H to FFH, is used for data and control information under instruction com- mand. 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 re- set by the SET [m].i and CLR [m].i instructions, respectively. They are also indirectly accessible through Memory pointer registers (MP0;01H, MP1;03H). Indirect addressing register Location 00H and 02H are indirect addressing registers that are not physically implemented. Any read/write operation of [00H] and [02H] can access the data memory pointed to by MP0 (01H) and MP1 (03H) respectively. Reading lo- cation 00H or 02H indirectly will return the re- sult 00H. Writing indirectly results in no operation. The function of data movement between two in- direct addressing registers is not supported. The memory pointer registers, MP0 and MP1, are 8-bit registers which can be used to access the data memory by combining corresponding indirect addressing registers. Accumulator The accumulator is closely related to the ALU operations. It is also mapped to location 05H of the data memory and is capable of carrying out immediate data operations. The data move- ment between two data memory locations must pass through the accumulator. Arithmetic and logic unit - ALU This circuit performs 8-bit arithmetic and logic operation. The ALU provides the following func- tions: · Arithmetic operations (ADD, ADC, SUB, SBC, DAA) · Logic operations (AND, OR, XOR, CPL) · Rotation (RL, RR, RLC, RRC) · Increment and Decrement (INC, DEC) · Branch decision (SZ, SNZ, SIZ, SDZ ....) The ALU not only saves the results of a data op- eration but also changes the status register. Status register - Status The 8-bit status register (0AH) contains the zero flag (Z), carry flag (C), auxiliary carry flag (AC), overflow flag (OV), power down flag (PD) and watch dog time-out flag (TO). The status register not only records the status information but also controls the operation sequence. With the exception of the TO and PD flags, bits in the status register can be altered by instruc- tions like most other registers. Any data writ- ten into the status register will not change the TO or PD flags. It should be noted that opera- tions related to the status register may give dif- ferent results from those intended. The TO and PD flags can only be changed by system power up, Watchdog Timer overflow, executing the HALT instruction and clearing the Watchdog Timer. The Z, OV, AC and C flags generally reflect the status of the latest operations. In addition, on entering an interrupt sequence or executing a subroutine call, the status regis- ter will not be automatically pushed onto the stack. If the contents of status are important and if the subroutine can corrupt the status register, precaution must be taken to save it properly. |
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