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SN8P1602A Datasheet(PDF) 23 Page - SONiX Technology Company |
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SN8P1602A Datasheet(HTML) 23 Page - SONiX Technology Company |
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23 / 76 page  SN8P1602B 8-Bit Micro-Controller SONiX TECHNOLOGY CO., LTD Page 23 Version 1.2 WORKING REGISTERS These Y,Z registers can be used as the general-purpose working buffer or access ROM’s and RAM’s data. For instance, all of the ROM table can be looked-up by Y and Z registers. The data of RAM memory can be indirectly accessed with Y and Z registers. Y, Z REGISTERS The Y and Z registers are the 8-bit buffers. There are three major functions of these registers. can be used as general working registers can be used as RAM data pointers with @YZ register can be used as ROM data pointer with the MOVC instruction for look-up table 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 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W After reset 0 0 0 0 0 0 0 0 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 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W After reset 0 0 0 0 0 0 0 0 Example: uses YZ register as the data pointer to access data in the RAM address 025H of bank0. B0MOV Y, #00H ; To set RAM bank 0 for Y register B0MOV Z, #25H ; To set location 25H for Z register B0MOV A, @YZ ; To read a data into ACC Example: uses the YZ register as data pointer to clear the RAM data B0MOV Y, #0 ; Y = 0, bank 0 B0MOV Z, #07FH ; Y = 7FH, the last address of the data memory area CLR_YZ_BUF: CLR @YZ ; Clear @YZ to be zero DECMS Z ; Z – 1, if Z= 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 . |
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