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D17133CS Datasheet(PDF) 156 Page - NEC |
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D17133CS Datasheet(HTML) 156 Page - NEC |
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156 / 289 page  CHAPTER 13 PERIPHERAL HARDWARE 141 13.3.3 Setting Values in the Shift Register Values are set in the shift register via the data buffer (DBF) using the PUT instruction. The peripheral address of the shift register is 01H. When sending a value to the shift register using the PUT instruction, only the low-order eight bits (DBF1, DBF0) of DBF are valid. The DBF3 and DBF2 values do not affect the shift register. Figure 13-16. Setting a Value in the Shift Register Example of setting value 64H in the shift register SIODATL DAT 4H ; SIODATL is assigned to 4H using symbol definition. SIODATH DAT 6H ; SIODATH is assigned to 6H using symbol definition. MOV DBF0, #SIODATL ; MOV DBF1, #SIODATH ; PUT SIOSFR, DBF ; Value is transmitted using reserved word SIOSFR. PUT SIOSFR,DBF SIOSFR (Peripheral Address 01H) Data Buffer DBF3 Don't care 8-bit data b7 0 b5 1 b4 0 b3 0 b2 1 b1 0 b0 0 b6 1 b0 0 b1 0 b2 1 b3 0 b0 0 b1 1 b2 1 b3 0 b0 b1 b2 b3 b0 b1 b2 b3 DBF2 Don't care DBF1 DBF0 |
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