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ST7LITE25F2 数据表(PDF) 99 Page - STMicroelectronics |
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ST7LITE25F2 数据表(HTML) 99 Page - STMicroelectronics |
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99 / 166 page  ST7LITE20F2 ST7LITE25F2 ST7LITE29F2 On-chip peripherals Doc ID 8349 Rev 5 99/166 Figure 48. Single master / multiple slave configuration 11.4.6 Low power modes Using the SPI to wake up the device from HALT mode In slave configuration, the SPI is able to wake up the Device from HALT mode through a SPIF interrupt. The data received is subsequently read from the SPIDR register when the software is running (interrupt vector fetch). If multiple data transfers have been performed before software clears the SPIF bit, then the OVR bit is set by hardware. Note: When waking up from HALT mode, if the SPI remains in Slave mode, it is recommended to perform an extra communications cycle to bring the SPI from HALT mode state to normal state. If the SPI exits from Slave mode, it returns to normal state immediately. Caution: The SPI can wake up the Device from HALT mode only if the Slave Select signal (external SS pin or the SSI bit in the SPICSR register) is low when the Device enters HALT mode. So if Slave selection is configured as external (see Section : Slave select management), make sure the master drives a low level on the SS pin when the slave enters HALT mode. MISO MOSI MOSI MOSI MOSI MOSI MISO MISO MISO MISO SS SS SS SS SS SCK SCK SCK SCK SCK 5V Slave Device Slave Device Slave Device Slave Device Master Device Table 40. WAIT and HALT mode description Mode Description WAIT No effect on SPI. SPI interrupt events cause the device to exit from WAIT mode. HALT SPI registers are frozen. In HALT mode, the SPI is inactive. SPI operation resumes when the Device is woken up by an interrupt with “exit from HALT mode” capability. The data received is subsequently read from the SPIDR register when the software is running (interrupt vector fetching). If several data are received before the wakeup event, then an overrun error is generated. This error can be detected after the fetch of the interrupt routine that woke up the Device. |
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