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SN8A1702AX データシート(PDF) 26 Page - SONiX Technology Company |
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SN8A1702AX データシート(HTML) 26 Page - SONiX Technology Company |
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26 / 112 page  Preliminary SN8P1702A/SN8P1703A 8-bit micro-controller build-in 12-bit ADC SONiX TECHNOLOGY CO., LTD Page 26 Revision 0.5 WORKING REGISTERS The locations 82H to 84H of RAM bank 0 in data memory stores the specially defined registers such as register R, Z, Y, respectively shown in the following table. These registers can use as the general purpose of working buffer and be used to access ROM’s and RAM’s data. For instance, all of the ROM’s table can be looked-up with R, Y and Z registers. The data of RAM memory can be indirectly accessed with Y and Z registers. 82H 83H 84H RAM R Z Y R/W R/W R/W Y, Z REGISTERS The Y and Z registers are the 8-bit buffers. There are three major functions of these registers. First, Y and Z registers can be used as working registers. Second, these two registers can be used as data pointers for @YZ register. Third, the registers can be address ROM location in order to look-up ROM data. Y initial value = 0000 0000 084H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Y YBIT7 YBIT6 YBIT5 YBIT4 YBIT3 YBIT2 YBIT1 YBIT0 R/W R/W R/W R/W R/W R/W R/W R/W Z initial value = 0000 0000 083H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Z ZBIT7 ZBIT6 ZBIT5 ZBIT4 ZBIT3 ZBIT2 ZBIT1 ZBIT0 R/W R/W R/W R/W R/W R/W R/W R/W The @YZ that is data point_1 index buffer located at address E7H in RAM bank 0. It employs Y and Z registers to addressing RAM location in order to read/write data through ACC. The Lower 4-bit of Y register is pointed to RAM bank number and Z register is pointed to RAM address number, respectively. The higher 4-bit data of Y register is truncated in RAM indirectly access mode. Example: If want to read a data from RAM address 25H of bank 1, it can use indirectly addressing mode to access data as following. B0MOV Y, #01H ; To set RAM bank 1 for Y register B0MOV Z, #25H ; To set location 25H for Z register B0MOV A, @YZ ; To read a data into ACC Example: Clear general-purpose data memory area of bank 1 using @YZ register. MOV A, #1 B0MOV Y, A ; Y = 1, bank 1 MOV A, #07FH B0MOV Z, A ; Y = 7FH, the last address of the data memory area CLR_YZ_BUF: CLR @YZ ; Clear @YZ to be zero DECMS Z ; Y – 1, if Y= 0, finish the routine JMP CLR_YZ_BUF ; Not zero CLR @YZ END_CLR: ; End of clear general purpose data memory area of bank 0 Note: Please consult the “LOOK-UP TABLE DESCRIPTION” about Y, Z register look-up table application. |
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