EFM32G-DK3550【PDF 179/467 页】KIT DEVELOPMENT EFM32 GECKO

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...the world's most energy friendly microcontrollers

Asynchronous or synchronous mode can be selected by configuring SYNC in USARTn_CTRL. The

options are listed with supported protocols in Table 16.1 (p. 179) . Full duplex and half duplex

communication is supported in both asynchronous and synchronous mode.

Table 16.1. USART Asynchronous vs. Synchronous Mode

SYNC

0

1

Communication Mode

Asynchronous

Synchronous

Supported Protocols

RS-232, RS-485 (w/external driver), IrDA, ISO 7816

SPI, MicroWire, 3-wire

Table 16.2 (p. 179) explains the functionality of the different USART pins when the USART operates

in different modes. Pin functionality enclosed in square brackets is optional, and depends on additional

configuration parameters. LOOPBK and MASTER are discussed in Section 16.3.2.5 (p. 187) and

Section 16.3.3.3 (p. 194) respectively.

Table 16.2. USART Pin Usage

Pin functionality

SYNC

LOOPBK

MASTER

U(S)n_TX

U(S)n_RX (MISO)

USn_CLK

USn_CS

(MOSI)

0

1

1

1

1

1

0

1

0

0

1

1

x

x

0

1

0

1

Data out

Data out/in

Data in

Data out

Data out/in

Data out/in

Data in

-

Data out

Data in

-

-

-

-

Clock in

Clock out

Clock in

Clock out

[Driver enable]

[Driver enable]

Slave select

[Auto slave select]

Slave select

[Auto slave select]

16.3.2 Asynchronous Operation

16.3.2.1 Frame Format

The frame format used in asynchronous mode consists of a set of data bits in addition to bits for

synchronization and optionally a parity bit for error checking. A frame starts with one start-bit (S), where

the line is driven low for one bit-period. This signals the start of a frame, and is used for synchronization.

Following the start bit are 4 to 16 data bits and an optional parity bit. Finally, a number of stop-bits, where

the line is driven high, end the frame. An example frame is shown in Figure 16.2 (p. 179) .

Figure 16.2. USART Asynchronous Frame Format

Fram e

Stop or idle

Start o r idle

S

0

1

2

3

4

[ 5]

[ 6]

[ 7]

[ 8]

[ P]

Stop

The number of data bits in a frame is set by DATABITS in USARTn_FRAME, see Table 16.3 (p. 180)

, and the number of stop-bits is set by STOPBITS in USARTn_FRAME, see Table 16.4 (p. 180) .

Whether or not a parity bit should be included, and whether it should be even or odd is defined by

PARITY, also in USARTn_FRAME. For communication to be possible, all parties of an asynchronous

transfer must agree on the frame format being used.

2011-04-12 - d0001_Rev1.10

179

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