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HT82D20R Datasheet(PDF) 9 Page - Holtek Semiconductor Inc |
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HT82D20R Datasheet(HTML) 9 Page - Holtek Semiconductor Inc |
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9 / 42 page  HT82D20R/HT82D20A Rev. 1.00 9 November 3, 2009 Data Memory - RAM for Bank 1 The special function registers used in the USB interface are located in RAM Bank1. In order to access Bank1 register, only the Indirect addressing pointer MP1 can be used and the Bank register BP should be set to 1. The RAM bank 1 mapping is as shown. Address 00H~1FH in RAM Bank0 and Bank1 are lo- cated in the same Registers Indirect Addressing Register Locations 00H and 02H are indirect addressing regis- ters (IAR0:00H; IAR1:02H) that are not physically imple- mented. Any read/write operation on [00H] ([02H]) will access the data memory pointed to by MP0 (MP1). Reading location 00H (02H) indirectly will return the re- sult 00H. Writing indirectly results in no operation. The indirect addressing pointer (MP0) always points to Bank0 RAM addresses no matter the value of Bank Register (BP). The indirect addressing pointer (MP1) can access Bank0 or Bank1 RAM data according to the value of BP which is set to 0 or 1 respectively. The memory pointer registers (MP0 and MP1) are 7-bit registers. Accumulator The accumulator is closely related to ALU operations. It is also mapped to location 05H of the data memory and can carry out immediate data operations. The data movement between two data memory locations must pass through the accumulator. Arithmetic and Logic Unit - ALU This circuit performs 8-bit arithmetic and logic opera- tions. 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 addition, opera- tions related to the status register may give different re- sults from those intended. 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 A H 1 B H 1 C H 1 D H 1 E H 1 F H 2 0 H I A R 0 M P 0 I A 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 T M R H T M R L T M R C P A P A C P B P B C U S C U S R S C C T B H P P i p e _ c t r l A W R S T A L L P I P E S I E S M I S C F I F O 0 F I F O 1 B a n k 1 1 9 H 4 2 H 4 3 H 4 4 H 4 5 H 4 6 H 4 7 H 4 8 H 4 9 H 4 1 H Bank 1 RAM Mapping |
Similar Part No. - HT82D20R |
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Similar Description - HT82D20R |
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