CC1110-RTR1 datasheet(139/203 Pages) TI

139 / 203 page

CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 139 of 202

Figure 28: SPI Dataflow

13.13.3 Baud Rate Generation

An internal baud rate generator sets the

UART baud rate when operating in UART

mode and the SPI master clock frequency

when operating in SPI mode.

The

UxBAUD.BAUD_M[7:0]

and

UxGCR.BAUD_E[4:0] registers define the

baud rate used for UART transfers and the

rate of the serial clock for SPI transfers.

The baud rate is given by the following

equation:

BAUD

Baudrate

BAUD

∗

)

256

(

where F is the system clock frequency set

by the selected system clock source.

The register values required for standard

baud rates are shown in Table 39 for a

typical system clock set to 26 MHz. The

table also gives the difference in actual

baud rate to standard baud rate value as a

percentage error.

The maximum baud rate for UART mode

is F/16 when BAUD_E is 16 and BAUD_M

is 0, and where F is the system clock

frequency.

The maximum SPI clock frequency for SPI

mode is F/2 when BAUD_E is 19 and

BAUD_M is 0, and where F is the system

clock frequency. Setting higher clock

frequencies than this will give erroneous

results.

CC1110-RTR1 데이터시트(PDF) 139 Page - Texas Instruments

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