MMC2107 - Freescale Semiconductor

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Freescale Semiconductor, Inc. Serial Communications Interface Modules (SCI1 and SCI2) 16.4 Block Diagram IPBUS RXD PIN SCBR[12:0] SCI DATA REGISTER RECEIVE SHIFT REGISTER RAF FE PF NF R8 IDLE RDRF OR ILIE IDLE INTERRUPT REQUEST RDRF/OR INTERRUPT REQUEST nc... SYSTEM CLOCK BAUD RATE GENERATOR RECEIVE AND WAKEUP CONTROL RE RWU LOOPS RIE Freescale Semiconductor, I TXD PIN ÷16 DATA FORMAT CONTROL TRANSMIT CONTROL TRANSMIT SHIFT REGISTER SCI DATA REGISTER IPBUS RSRC WAKE ILT LOOPS SBK Figure 16-1. SCI Block Diagram M PE PT TE RSRC TDRE TC T8 TIE TCIE TDRE INTERRUPT REQUEST TC INTERRUPT REQUEST Technical Data MMC2107 – Rev. 2.0 332 Serial Communications Interface Modules (SCI1 and SCI2) MOTOROLA For More Information On This Product, Go to: www.freescale.com
Freescale Semiconductor, Inc. Serial Communications Interface Modules (SCI1 and SCI2) Modes of Operation 16.5 Modes of Operation SCI operation is identical in run, special, and emulation modes. The SCI has two low-power modes, doze and stop. NOTE: Run mode is the normal mode of operation and the WAIT instruction does not affect SCI operation. nc... Freescale Semiconductor, I 16.5.1 Doze Mode 16.5.2 Stop Mode When the SCIDOZ bit in the SCI pullup and reduced drive (SCIPURD) register is set, the DOZE instruction stops the SCI clock and puts the SCI in a low-power state. The DOZE instruction does not affect SCI register states. Any transmission or reception in progress stops at doze mode entry and resumes when an internal or external interrupt request brings the CPU out of doze mode. Exiting doze mode by reset aborts any transmission or reception in progress and resets the SCI. When the SCIDOZ bit is clear, execution of the DOZE instruction has no effect on the SCI. Normal module operation continues, allowing any SCI interrupt to bring the CPU out of doze mode. The STOP instruction stops the SCI clock and puts the SCI in a low-power state. The STOP instruction does not affect SCI register states. Any transmission or reception in progress halts at stop mode entry and resumes when an external interrupt request brings the CPU out of stop mode. Exiting stop mode by reset aborts any transmission or reception in progress and resets the SCI. MMC2107 – Rev. 2.0 Technical Data MOTOROLA Serial Communications Interface Modules (SCI1 and SCI2) 333 For More Information On This Product, Go to: www.freescale.com
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MMC2107 - Freescale Semiconductor

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