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SIO1007 数据表(PDF) 40 Page - Microchip Technology |
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SIO1007 数据表(HTML) 40 Page - Microchip Technology |
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40 / 108 page  SIO1007 DS00002020A-page 40 2005 - 2015 Microchip Technology Inc. 11.0 POWER MANAGEMENT Power management capabilities are provided for the following logical devices: UART 1, and UART 2. For each logical device, two types of power management are provided: direct powerdown and auto powerdown. 11.1 UART Power Management Direct power management is controlled by CR02. Refer to the Configuration section for more information. Auto Power Management is enabled by the UART1 and UART2 enable bits in CR07. When set, these bits allow the following auto power management operations: 1. The transmitter enters auto powerdown when the transmit buffer and shift register are empty. 2. The receiver enters powerdown when the following conditions are all met: a) Receive FIFO is empty b) The receiver is waiting for a start bit. 11.1.1 EXIT AUTO POWERDOWN The transmitter exits powerdown on a write to the XMIT buffer. The receiver exits auto powerdown when RXDx changes state. Note: While in powerdown the Ring Indicator interrupt is still valid and transitions when the RI input changes. |
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