Datasheet

xiv
MCF5307 User’s Manual
CONTENTS
Paragraph
Number
Title
Page
Number
14.3.4 UART Clock-Select Registers (UCSRn)...................................................... 14-8
14.3.5 UART Command Registers (UCRn)............................................................ 14-9
14.3.6 UART Receiver Buffers (URBn) ............................................................... 14-11
14.3.7 UART Transmitter Buffers (UTBn) ........................................................... 14-11
14.3.8 UART Input Port Change Registers (UIPCRn).......................................... 14-12
14.3.9 UART Auxiliary Control Register (UACRn)............................................. 14-12
14.3.10 UART Interrupt Status/Mask Registers (UISRn/UIMRn).......................... 14-13
14.3.11 UART Divider Upper/Lower Registers (UDUn/UDLn) ............................ 14-14
14.3.12 UART Interrupt Vector Register (UIVRn)................................................. 14-15
14.3.13 UART Input Port Register (UIPn).............................................................. 14-15
14.3.14 UART Output Port Command Registers (UOP1n/UOP0n) ....................... 14-15
14.4 UART Module Signal Definitions.................................................................. 14-16
14.5 Operation......................................................................................................... 14-18
14.5.1 Transmitter/Receiver Clock Source............................................................ 14-18
14.5.1.1 Programmable Divider............................................................................ 14-18
14.5.1.2 Calculating Baud Rates........................................................................... 14-19
14.5.1.2.1 BCLKO Baud Rates ........................................................................... 14-19
14.5.1.2.2 External Clock .................................................................................... 14-19
14.5.2 Transmitter and Receiver Operating Modes............................................... 14-19
14.5.2.1 Transmitting ........................................................................................... 14-21
14.5.2.2 Receiver .................................................................................................. 14-22
14.5.2.3 FIFO Stack ............................................................................................. 14-24
14.5.3 Looping Modes........................................................................................... 14-25
14.5.3.1 Automatic Echo Mode............................................................................ 14-25
14.5.3.2 Local Loop-Back Mode.......................................................................... 14-25
14.5.3.3 Remote Loop-Back Mode....................................................................... 14-26
14.5.4 Multidrop Mode.......................................................................................... 14-26
14.5.5 Bus Operation ............................................................................................. 14-28
14.5.5.1 Read Cycles ............................................................................................ 14-28
14.5.5.2 Write Cycles ........................................................................................... 14-28
14.5.5.3 Interrupt Acknowledge Cycles ............................................................... 14-28
14.5.6 Programming .............................................................................................. 14-28
14.5.6.1 UART Module Initialization Sequence .................................................. 14-29
Chapter 15
Parallel Port (General-Purpose I/O)
15.1 Parallel Port Operation...................................................................................... 15-1
15.1.1 Pin Assignment Register (PAR) ................................................................... 15-1
15.1.2 Port A Data Direction Register (PADDR).................................................... 15-2
15.1.3 Port A Data Register (PADAT).................................................................... 15-2
15.1.4 Code Example............................................................................................... 15-3
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emiconduct
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Freescale Semiconductor, Inc.
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