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HCS12 数据表(PDF) 76 Page - Freescale Semiconductor, Inc |
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HCS12 数据表(HTML) 76 Page - Freescale Semiconductor, Inc |
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76 / 452 page ![]() S12CPUV2 Reference Manual, Rev. 4.0 76 Freescale Semiconductor 5.19.3 Bit Condition Branch Instructions The bit condition branches are taken when bits in a memory byte are in a specific state. A mask operand is used to test the location. If all bits in that location that correspond to ones in the mask are set (BRSET) or cleared (BRCLR), the branch is taken. The numeric range of 8-bit offset values is $80 (–128) to $7F (127) from the address of the next memory location after the offset value. Table 5-19 is a summary of bit condition branches. Table 5-19. Bit Condition Branch Instructions Mnemonic Function Equation or Operation BRCLR Branch if selected bits clear (M) • (mm) = 0 BRSET Branch if selected bits set (M) • (mm) = 0 |
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