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MMA6525KW 数据表(PDF) 50 Page - Freescale Semiconductor, Inc |
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MMA6525KW 数据表(HTML) 50 Page - Freescale Semiconductor, Inc |
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50 / 56 page ![]() Sensor 50 Freescale Semiconductor, Inc. MMA65xx 4.5 Exception Handling The following sections describe the conditions and the device response for each detectable exception. In the event that mul- tiple exceptions exist, the exception response is determined by the priority listed in Table 33. 4.5.1 SPI Error The following SPI conditions result in a SPI error: • SCLK is high when CS is asserted • The number of SCLK rising edges detected while CS is asserted is not equal to 16 • SCLK is high when CS is negated • Command message parity error (MOSI) • Bit 15 of Acceleration Data Request is not equal to ‘0’ • Bits 4 through 11 of an Acceleration Request are not equal to ‘0’ • Bits 3 of an Acceleration Request is not equal to ‘1’ • Bits 0 through 7 of a Register Read Request are not equal to ‘0’ The device responds to a SPI error with a “SPI Error” response as shown in Table 30. This applies to both acceleration data request SPI errors, and Register Access SPI errors. The arming function will not be updated if a SPI Error is detected. The PCM output is not affected by a SPI Error. Table 33. SPI Error Response Priority Error Priority Exception Effect on Data SPI Data Arming Output PCM Output 1 SPI Error Error Response No Update No Effect 2 SPI MISO Error Error Response No Update No Effect 3 Invalid Request Error Response No Update No Effect 4 DEVINIT Bit Set Error Response No Update Disabled 5 DEVRES Error Error Response No Update Disabled 6 CRC Error Error Response No Update No Effect 7 Self Test Error Error Response No Update No Effect 8 Offset Monitor Error Error Response No Update No Effect |
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