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S3C72G9 Datasheet(PDF) 88 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 88 Page - Samsung semiconductor |
88 / 96 page ![]() ')'+'*,'!# SRB n Operation: Operand Operation Summary Bytes Cycles n Select register bank 2 2 Description: The SRB instruction selects one of four register banks in the working register memory area. The constant value used with SRB is 0, 1, 2, or 3. The following table shows the effect of SRB settings: ERB Setting SRB Settings Selected Register Bank 3 2 1 0 0 0 0 x x Always set to bank 0 0 0 Bank 0 1 0 0 0 1 Bank 1 1 0 Bank 2 1 1 Bank 3 , >9>1 The enable register bank flag (ERB) must always be set for the SRB instruction to execute successfully for register banks 0, 1, 2, and 3. In addition, if the ERB value is logic zero, register bank 0 is always selected, regardless of the SRB value. Operand Binary Code Operation Notation n 1 1 0 1 1 1 0 1 SRB ← n (n = 0, 1, 2, 3) 0 1 0 1 0 0 d1 d0 Example: If the ERB flag is set, the instruction SRB 3 selects register bank 3 (018H-01FH) as the working memory register bank. |
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