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HT56RB688 データシート(PDF) 30 Page - Holtek Semiconductor Inc |
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HT56RB688 データシート(HTML) 30 Page - Holtek Semiconductor Inc |
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30 / 164 page  location of these registers within the Data Memory begins at the address ²00H². Any unused Data Memory locations between these special function registers and the point where the General Purpose Memory begins is reserved for future expansion purposes, attempting to read data from these locations will return a unknow value. Indirect Addressing Registers - IAR0, IAR1 The Indirect Addressing Registers, IAR0 and IAR1, although having their locations in normal RAM register space, do not actually physically exist as normal registers. The method of indirect addressing for RAM data manipulation uses these Indirect Addressing Registers and Memory Pointers, in contrast to direct memory addressing, where the actual memory address is specified. Actions on the IAR0 and IAR1 registers will result in no actual read or write operation to these registers but rather to the memory location specified by their corresponding Memory Pointers, MP0 or MP1. Acting as a pair, IAR0 and MP0 can together access data from Bank 0 while the IAR1 and MP1 register pair can access data from any bank. As the Indirect Addressing Registers are not physically implemented, reading the Indirect Addressing Registers indirectly will return a result of ²00H² and writing to the registers indirectly will result in no operation. Memory Pointers - MP0, MP1 Two Memory Pointers, known as MP0 and MP1 are provided. These Memory Pointers are physically implemented in the Data Memory and can be manipulated in the same way as normal registers providing a convenient way with which to address and track data. When any operation to the relevant Indirect Addressing Registers is carried out, the actual address that the microcontroller is directed to, is the address specified by the related Memory Pointer. MP0, together with Indirect Addressing Register, IAR0, are used to access data from Bank 0, while MP1 and IAR1 are used to access data from all banks. The following example shows how to clear a section of four RAM locations already defined as locations adres1 to adres4. data .section ¢data¢ adres1 db ? adres2 db ? adres3 db ? adres4 db ? block db ? code .section at 0 ¢code¢ org 00h start: mov a,04h ; setup size of block mov block,a mov a,offset adres1 ; Accumulator loaded with first RAM address mov mp0,a ; setup memory pointer with first RAM address loop: clr IAR0 ; clear the data at address defined by MP0 inc mp0 ; increment memory pointer sdz block ; check if last memory location has been cleared jmp loop continue: The important point to note here is that in the example shown above, no reference is made to specific RAM addresses. Bank Pointer - BP The Data Memory is divided into a total of 32 banks. Selecting the required Data Memory area is achieved using the Bank Pointer. If data in Bank 0 is to be accessed, then the BP register must be loaded with the value 00H, while if data in Bank 1 is to be accessed, then the BP register must be Rev. 1.10 30 April 15, 2013 HT56RB688 TinyPowerTM A/D type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces |
同様の部品番号 - HT56RB688_13 |
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同様の説明 - HT56RB688_13 |
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