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ST10R272L-B0 数据表(PDF) 2 Page - STMicroelectronics |
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ST10R272L-B0 数据表(HTML) 2 Page - STMicroelectronics |
2 / 4 page ST10R272L-B0 Errata Sheet 2/4 2.2 ST_MAC.9: COCMP INSTRUCTION INVERTED OPERANDS According to the ST10 Family Programming Manual, the CoCmp instruction substracts a 40-bit signed operand from the 40-bit accumulator content (acc - op2\op1), and updates the N, Z and C flags in the MSW register, leaving the accumulator unchanged. In error, the reverse operation (op2\op1 - acc) has been implemented in the MacUnit. There- fore, the N and C flags are set according to the reverse operation (Z flag is not affected). Workaround: Change interpretation of the N and C flags in the MSW register. 2.3 ST_MAC.10: E-FLAG EVALUATION FOR COSHR AND COASHR INSTRUCTIONS WHEN SATURATION MODE IS ENABLED The Logical and the Arithmetic Right Shift instructions (CoShr/CoAshr) are specified not to be affected by the saturation mode (MS bit of the MCW reg.). The result loaded in the accumulator is never saturat- ed but the evaluation of E flag in the MSW register is erroneous when saturation mode is enabled and the E flag would be set . In this example, the E flag is kept clear however MAE is used. Workaround: Disable saturation mode before using Logical and Arithmetic Right Shift in- structions and re-enable it just after. MS bit is set: saturation mode is enabled Accumulator SL E SV C Z N Example: Mov R5, #5555h -- ---- ----h - - - - - - CoLoad R5, R5 00 5555 5555h 0 0 0 0 0 0 Nop 00 5555 5555h 0 0 0 0 0 0 Mov MSW, #007Fh 7F 5555 5555h 0 0 0 0 0 0 Nop 7F 5555 5555h 0 0 0 0 0 0 CoShr #1 3F AAAA AAAAh 0 0 0 0 0 0 error |
类似零件编号 - ST10R272L-B0 |
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类似说明 - ST10R272L-B0 |
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