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HT48CU80 Datasheet(PDF) 10 Page - Holtek Semiconductor Inc |
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HT48CU80 Datasheet(HTML) 10 Page - Holtek Semiconductor Inc |
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10 / 54 page  HT48RU80/HT48CU80 Rev. 1.00 10 April 12, 2006 Arithmetic and Logic Unit - ALU This circuit performs 8-bit arithmetic and logic operations. The ALU provides the following functions: · 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 operation but also changes the status register. Status Register - STATUS This 8-bit register (0AH) contains the zero flag (Z), carry flag (C), auxiliary carry flag (AC), overflow flag (OV), power down flag (PDF), and watchdog time-out flag (TO). It also records the status information and controls the operation sequence. With the exception of the TO and PDF flags, bits in the status register can be altered by instructions like most other registers. Any data written into the status register will not change the TO or PDF flag. In addi- tion, operations related to the status register may 0 0 H 0 1 H 0 2 H 0 3 H 0 4 H 0 5 H 0 6 H 0 7 H 0 8 H 0 9 H 0 A H 0 B H 0 C H 0 D H 0 E H 0 F H 1 0 H 1 1 H 1 2 H 1 3 H 1 4 H 1 5 H 1 6 H 1 7 H 1 8 H 1 9 H 1 A H 1 B H 1 C H 1 D H 1 E H 1 F H 2 0 H 2 1 H I n d i r e c t A d d r e s s i n g R e g i s t e r 0 M P 0 I n d i r e c t A d d r e s s i n g R e g i s t e r 1 M P 1 B P A C C P C L T B L P T B L H W D T S S T A T U S I N T C 0 T M R 0 H T M R 0 L T M R 0 C T M R 1 H T M R 1 L T M R 1 C P A P A C P B P B C P C P C C P D P D C P E P E C P F P F C P G C T M R 2 T M R 2 C T B H P P G U S R U C R 1 U C R 2 T X R / R X R B R G 2 2 H 2 3 H 2 4 H 2 5 H 2 6 H 2 7 H 2 8 H 2 9 H 2 A H 2 B H 2 C H ( 1 9 2 x 3 b y t e s ) B a n k 0 F F H 4 0 H G e n e r a l P u r p o s e D a t a M e m o r y S p e c i a l F u n c t i o n R e g i s t e r s B a n k 1 B a n k 2 : U n u s e d , R e a d a s " 0 0 " I N T C 1 RAM Mapping |
Similar Part No. - HT48CU80 |
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Similar Description - HT48CU80 |
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