UART ModulesMCF5253 Reference Manual, Rev. 115-20 Freescale Semiconductor15.4.5 Command Registers (UCRn)The UCR supplies commands to the UART. Multiple commands can be specified in a single write to theUCR if the commands are not conflicting. For example, reset-transmitter and enable-transmittercommands cannot be specified in a single command.15.4.5.1 Miscellaneous CommandsBits MISC3 through MISC0 select a single command as listed in Table 15-9.15.4.5.1.1 Reset Mode Register PointerThe reset mode register pointer command causes the mode register pointer to point to UMR1.15.4.5.1.2 Reset ReceiverThe reset receiver command resets the receiver. The receiver is immediately disabled, the FFULL andRxRDY bits in the USR are cleared, and the receiver FIFO pointer is reinitialized. All other registers areunaltered. Use this command instead of the receiver-disable command whenever the receiverconfiguration is changed (it places the receiver in a known state).Address MBAR + $1C8 (UCR0)MBAR + $208 (UCR1)MBAR2 + $C08 (UCR2)Access: User write only7 6 5 4 3 2 1 0RW MISC2 MISC1 MISC0 TC1 TC0 RC1 RC0Reset 0 0 0 0 0 0 0 0Figure 15-12. Command Register (UCRn)Table 15-9. MISCx Control BitsMISC2 MISC1 MISC0 Command0 0 0 No Command0 0 1 Reset Mode Register Pointer0 1 0 Reset Receiver0 1 1 Reset Transmitter1 0 0 Reset Error Status1 0 1 Reset Break-Change Interrupt1 1 0 Start Break1 1 1 Stop Break
