Receive Operation In Uart Mode; Initial Settings For Uart Reception - Mitsubishi Electric M32R Series User Manual

Mitsubishi 32-bit risc single-chip microcomputers

Table of Contents

12.7 Receive Operation in UART Mode

To receive data in UART mode, initialize the serial I/O following the procedure described below.

(1) Setting SIO Transmit/Receive Mode Register

• Set the register to UART mode

• Set parity (when enabled, select odd/even)

• Set stop bit length

• Set character length

Note : During UART mode, settings of the internal/external clock select bit have no effect (only

the internal clock is useful).

(2) Setting SIO Transmit Control Register

• Select the clock divider's divide-by ratio.

(3) Setting SIO Baud Rate Register

Set a baud rate generator value. (Refer to Section 12.6.1, "Setting the UART Baud Rate.")

(4) Setting SIO interrupt related registers

• Cause of Receive Interrupt Select Register

Select the cause of receive interrupt (receive finished/receive error)

• Interrupt Mask Register

Enable/disable receive interrupts

(5) Setting the Interrupt Controller

When you use interrupts during reception, set its priority level.

(6) Setting DMAC

When you issue DMA transfer requests to the internal DMAC when reception is completed, set

the DMAC. (Refer to Chapter 9, "DMAC.")

(7) Selecting pin functions

Because the serial I/O related pins serve dual purposes (shared with input/output ports), set pin

functions. (Refer to Chapter 8, "Input/Output Ports and Pin Functions.")

12.7 Receive Operation in UART Mode