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S3C72G9 Datasheet(PDF) 87 Page - Samsung semiconductor |
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S3C72G9 Datasheet(HTML) 87 Page - Samsung semiconductor |
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87 / 96 page  ')'+ '2%!"# SMB n Operation: Operand Operation Summary Bytes Cycles n Select memory bank 2 2 Description: The SMB instruction sets the upper four bits of a 12-bit data memory address to select a specific memory bank. The constants 0, n, and 15 are usually used as the SMB operand to select the corresponding memory bank. All references to data memory addresses fall within the following address ranges: Please note that since data memory spaces differ for various devices in the SAM4 product family, the 'n' value of the SMB instruction will also vary. Addresses Register Areas Bank SMB 000H-01FH Working registers 0 0 020H-0FFH Stack and general-purpose registers n00H-nFFH General-purpose registers n (n = 1-14) n (n = 1-14) F80H-FFFH I/O-mapped hardware registers 15 15 The enable memory bank (EMB) flag must always be set to "1" in order for the SMB instruction to execute successfully for memory banks 0-15. Format Binary Code Operation Notation n 1 1 0 1 1 1 0 1 SMB ← n (n = 0-15) 0 1 0 0 d3 d2 d1 d0 Example: If the EMB flag is set, the instruction SMB 0 selects the data memory address range for bank 0 (000H-0FFH) as the working memory bank. , ) * |
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