CC2550-RTR1 datasheet(44/55 Pages) TI

44 / 55 page

CC2550

PRELIMINARY Data Sheet (Rev.1.2)

SWRS039A

Page 44 of 54

0x18: MCSM0 – Main Radio Control State Machine configuration

Bit

Field Name

Reset

R/W

Description

7:6

Reserved

5:4

FS_AUTOCAL[1:0]

0 (00)

R/W

Automatically calibrate when going to TX or back to IDLE

Setting

When to perform automatic calibration

0 (00)

Never (manually calibrate using SCAL strobe)

1 (01)

When going from IDLE to TX (or FSTXON)

2 (10)

When going from TX back to IDLE

3 (11)

Every 4

th time when going from TX to IDLE

3:2

PO_TIMEOUT

2 (10)

R/W

Programs the number of times the six-bit ripple counter must expire

after XOSC has stabilized before CHP_RDYn goes low.

The XOSC is off during power-down so the regulated digital supply

voltage has time to stabilize while waiting for the crystal to be stable

even with PO_TIMEOUT to 0.

Setting

Expire count

Timeout after XOSC start

0 (00)

Approx. 2.3 – 2.4 µs

1 (01)

Approx. 37 – 39 µs

2 (10)

Approx. 149 – 155 µs

3 (11)

256

Approx. 597 – 620 µs

Exact timeout depends on crystal frequency.

In order to reduce start up time from the SLEEP state, this field is

preserved in powerdown (SLEEP state).

1:0

Reserved

Defined on the transceiver version

0x22: FREND0 – Front end TX configuration

Bit

Field Name

Reset

R/W

Description

7:6

Reserved

5:4

LODIV_BUF_CURRENT_TX[1:0]

1 (01)

R/W

Adjusts current TX LO buffer (input to PA). The

value to use in this field is given by the SmartRF®

Studio software.

Reserved

2:0

PA_POWER[2:0]

0 (000)

R/W

Selects PA power setting. This value is an index to

the PATABLE, which can be programmed with up to

8 different PA settings. The PATABLE settings from

index ‘0’ to the PA_POWER value are used for

power ramp-up/ramp-down at the start/end of

transmission in all TX modulation formats.

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