CC1150-RTR1 datasheet(33/67 Pages) TI

33 / 67 page

CC1150

SWRS037A

Page 33 of 60

Description

XOSC

periods

26 MHz

crystal

Idle to TX/FSTXON, no calibration

2298

88.4 µs

Idle to TX/FSTXON, with calibration

~21037

809 µs

TX to IDLE, no calibration

0.1 µs

TX to IDLE, including calibration

~18739

721 µs

Manual calibration

~18739

721 µs

Table 20: State Transition Timing

17 Data FIFO

The

CC1150 contains a 64 byte FIFO for data to

be transmitted. The SPI interface is used for

writing to the TX FIFO. Section 10.5 contains

details on the SPI FIFO access. The FIFO

controller will detect underflow in the TX FIFO.

When writing to the TX FIFO, it is the

responsibility of the MCU to avoid TX FIFO

overflow. This will not be detected by the

CC1150. A TX FIFO overflow will result in an

error in the TX FIFO content.

FIFO_THR

Bytes in TX FIFO

0 (0000)

1 (0001)

2 (0010)

3 (0011)

4 (0100)

5 (0101)

6 (0110)

7 (0111)

8 (1000)

9 (1001)

10 (1010)

11 (1011)

12 (1100)

13 (1101)

14 (1110)

15 (1111)

Table 21: FIFO_THR Settings and the

corresponding FIFO Thresholds

The chip status byte that is available on the SO

pin while transferring the SPI address contains

the fill grade of the TX FIFO. Section 10.1 on

page 19 contains more details on this.

The number of bytes in the TX FIFO can also

be read from the TXBYTES.NUM_TXBYTES

status register.

The 4-bit FIFOTHR.FIFO_THR setting is used

to program the FIFO threshold point. Table 21

lists the 16 FIFO_THR settings and the

corresponding thresholds for the TX FIFO.

8 bytes

Underflow

margin

FIFO_THR=13

TXFIFO

Figure 19: Example of FIFO at Threshold

A flag will assert when the number of bytes in

the FIFO is equal to or higher than the

programmed threshold. The flag is used to

generate the FIFO status signals that can be

viewed on the GDO pins (see section 22 on

page 37).

Figure 19 shows the number of bytes in the TX

FIFO when the threshold flag toggles, in the

case of FIFO_THR=13. Figure 20 shows the

flag as the FIFO is filled above the threshold,

and then drained below.

NUM_TXBYTES

GDO

Figure 20: FIFO_THR=13 vs. Number of

Bytes in FIFO

CC1150-RTR1 Datasheet(PDF) 33 Page - Texas Instruments

CC1150-RTR1 Datasheet(HTML) 33 Page - Texas Instruments

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