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SN8F27E64LKB Datasheet(PDF) 35 Page - SONiX Technology Company |
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SN8F27E64LKB Datasheet(HTML) 35 Page - SONiX Technology Company |
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35 / 192 page  SN8F27E60 Series 8-Bit Flash Micro-Controller with Embedded ICE and ISP SONiX TECHNOLOGY CO., LTD Page 35 Version 1.4 2.2.6 X REGISTERS X register is an 8-bit buffer and only general working register purpose. Can be used as general working registers 085H Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 X XBIT7 XBIT6 XBIT5 XBIT4 XBIT3 XBIT2 XBIT1 XBIT0 Read/Write R/W R/W R/W R/W R/W R/W R/W R/W After reset - - - - - - - - 2.2.7 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 - - - - - - - - 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 - - - - - - - - Example: Uses Y, Z 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 Y, Z register as data pointer to clear the RAM data. B0MOV Y, #0 ; Y = 0, bank 0 B0MOV Z, #07FH ; Z = 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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