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HCS12 数据表(PDF) 73 Page - Freescale Semiconductor, Inc |
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HCS12 数据表(HTML) 73 Page - Freescale Semiconductor, Inc |
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73 / 452 page ![]() S12CPUV2 Reference Manual, Rev. 4.0 Freescale Semiconductor 73 5.19 Branch Instructions Branch instructions cause a sequence to change when specific conditions exist. The CPU12 uses three kinds of branch instructions. These are short branches, long branches, and bit condition branches. Branch instructions can also be classified by the type of condition that must be satisfied in order for a branch to be taken. Some instructions belong to more than one classification. For example: • Unary branch instructions always execute. • Simple branches are taken when a specific bit in the condition code register is in a specific state as a result of a previous operation. • Unsigned branches are taken when comparison or test of unsigned quantities results in a specific combination of condition code register bits. • Signed branches are taken when comparison or test of signed quantities results in a specific combination of condition code register bits. |
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