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HT46R54A Datasheet(PDF) 9 Page - Holtek Semiconductor Inc |
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HT46R54A Datasheet(HTML) 9 Page - Holtek Semiconductor Inc |
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9 / 43 page  HT46R53A/HT46R54A Rev. 1.00 9 August 24, 2006 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 and PDF flags. Addition opera- tions related to the status register may give different re- sults from those intended. The TO flag can be affected only by system power-up, a WDT time-out or executing the ²HALT² or ²CLR WDT² instruction. The PDF flag can be affected only by executing the ²HALT² or ²CLR WDT ² instruction or a system power-up. The Z, OV, AC, and C flags reflect the status of the latest operations. On entering the interrupt sequence or exe- cuting the subroutine call, the status register will not be automatically pushed onto the stack. If the contents of the status is important, and if the subroutine is likely to corrupt the status register, the programmer should take precautions and save it properly. S p e c i a l P u r p o s e D a t a M e m o r y 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 : U n u s e d R e a d a s " 0 0 " 2 0 H 2 1 H 2 2 H 2 3 H 2 4 H 2 7 H 2 8 H E 7 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 A C C P C L T B L P T B L H S T A T U S I N T C T M R T M R C P A P A C P B P B C P C P C C P D P D C P W M A D R L A D R H A D C R A C S R G e n e r a l P u r p o s e D a t a M e m o r y ( 1 9 2 B y t e s ) 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 : U n u s e d R e a d a s " 0 0 " 2 0 H 2 1 H 2 2 H 2 3 H 2 4 H 2 7 H 2 8 H F F 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 S T A T U S I N T C T M R T M R C P A P A C P B P B C P C P C C P D P D C P W M A D R L A D R H A D C R A C S R G e n e r a l P u r p o s e D a t a M e m o r y ( 2 1 6 B y t e s ) S p e c i a l P u r p o s e D a t a M e m o r y G e n e r a l P u r p o s e D a t a M e m o r y ( 6 4 B y t e s ) B a n k 1 4 0 H 7 F H H T 4 6 R 5 3 A H T 4 6 R 5 4 A RAM Mapping |
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Similar Description - HT46R54A |
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