Datasheet

UART Modules

12-34 MCF5206e USER’S MANUAL MOTOROLA

12.5 UART MODULE INITIALIZATION SEQUENCE

The following steps are required to properly initialize the UART module:

Command Register (UCR)

1. Reset the receiver and transmitter.

2. Program the vector number for a UART module interrupt. However, if the UART

Interrupt Control Register (ICR_U1) is programmed to generate an autovector, the

UART Interrupt Vector Register (UIVR) must be programmed with an autovector

number.

Interrupt Mask Register (UIMR)

1. Enable the desired interrupt sources.

Auxiliary Control Register (UACR)

1. Initialize the Input Enable Control (IEC) bit.

2. Select timer mode and clock source, if necessary.

Clock Select Register (UCSR)

1. Select the receiver and transmitter clock. Use timer as source, if required.

Mode Register 1 (UMR1)

1. If required, program operation of Receiver Ready-to-Send (RxRTS Bit).

2. Select Receiver-Ready or FIFO-Full Notification (R/F Bit).

3. Select character or block-error mode (ERR Bit).

4. Select parity mode and type (PM and PT Bits).

5. Select number of bits per character (B/Cx Bits).

Mode Register 2 (UMR2)

1. Select the mode of operation (CMx bits).

2. If required, program operation of Transmitter Ready-to-Send (TxRTS Bit).

3. If required, program operation of Clear-to-Send (TxCTS Bit).

4. Select stop-bit length (SBx Bits).

Command Register (UCR)

Enable the receiver and transmitter.

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