CC1110-RTR1 datasheet(140/203 Pages) TI

140 / 203 page

CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 140 of 202

Baud rate (bps)

UxBAUD.BAUD_M

UxGCR.BAUD_E

Error (%)

2400

131

0.04

4800

131

0.04

9600

131

0.04

14400

0.13

19200

131

0.04

28800

0.13

38400

131

0.04

57600

0.13

76800

131

0.04

115200

0.13

230400

164

0.02

Table 39: Commonly used baud rate settings for 26 MHz system clock

13.13.4 USART flushing

The current operation can be aborted by

setting the UxUCR.FLUSH register bit. This

event will immediately stop the current

operation and clear all data buffers.

13.13.5 USART Interrupts

Each USART has two interrupts. These

are the RX complete interrupt (URXx) and

the TX complete interrupt (UTXx).

The USART interrupt enable bits are found

in the IEN0 and IEN2 registers. The

interrupt flags are located in the TCON and

IRCON2 registers. Refer to section 12.7 on

page 45 for details of these registers. The

interrupt

enables

and

flags

are

summarized below.

Interrupt enables:

•

USART0 RX : IEN0.URX0IE

•

USART1 RX : IEN0.URX1IE

•

USART0 TX : IEN2.UTX0IE

•

USART1 TX : IEN2.UTX1IE

Interrupt flags:

•

USART0 RX : TCON.URX0

•

USART1 RX : TCON.URX1

•

USART0 TX : IRCON2.UTX0

•

USART1 TX : IRCON2.UTX1

13.13.6 USART DMA Triggers

There are two DMA triggers associated

with each USART. The DMA triggers are

activated by RX complete and TX

complete events i.e. the same events as

the USART interrupt requests. A DMA

channel can be configured using a USART

Receive/Transmit

buffer,

UxDBUF,

source or destination address.

Refer to Table 37 on page 84 for an

overview of the DMA triggers.

13.13.7 USART Registers

The registers for the USART are described

in this section. For each USART there are

five registers consisting of the following (x

refers to USART number i.e. 0 or 1):

•

UxCSR USART x Control and Status

•

UxUCR USART x UART Control

•

UxGCR USART x Generic Control

•

UxDBUF USART x Receive/Transmit

data buffer

•

UxBAUD USART x Baud Rate Control

CC1110-RTR1 데이터시트(PDF) 140 Page - Texas Instruments

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