CC2550-RTY1 datasheet(18/62 Pages) TI2

18 / 62 page

CC2550

SWRS039B

Page 18 of 58

The access to the PATABLE is either single

byte or burst access depending on the burst

bit. When using burst access the index counter

will count up; when reaching 7 the counter will

restart at 0. The R/W bit controls whether the

access is a write access (R/W=0) or a read

access (R/W=1).

If one byte is written to the PATABLE and this

value is to be read out then CSn must be set

high before the read access in order to set the

index counter back to zero.

Note that the content of the PATABLE is lost

when entering the SLEEP state.

See Section 21 on page 30 for output power

programming details.

Figure 8: Register Access Types

Microcontroller Interface and Pin Configuration

In a typical system,

CC2550 will interface to a

microcontroller. This microcontroller must be

able to:

• Program

CC2550 into different modes

• Write buffered data

• Read back status information via the 4-wire

SPI-bus configuration interface (SI, SO,

SCLK

and CSn)

11.1

Configuration Interface

The microcontroller uses four I/O pins for the

SPI configuration interface (SI, SO, SCLK and

CSn

). The SPI is described in Section 14 on

page 14.

11.2

General Control and Status Pins

The

CC2550 has one dedicated configurable

pin (GDO0) and one shared pin (GDO1) that can

output internal status information useful for

control software. These pins can be used to

generate interrupts on the MCU. See Section

25 page 33 for more details of the signals that

can be programmed. GDO1 is shared with the

pin in the SPI interface. The default setting

for GDO1/SO is 3-state output. By selecting

any other of the programming options the

GDO1/SO

pin will become a generic pin. When

CSn

is low, the pin will always function as a

normal SO pin.

In the synchronous and asynchronous serial

modes, the GDO0 pin is used as a serial TX

data input pin while in transmit mode.

The GDO0 pin can also be used for an on-chip

analog temperature sensor. By measuring the

voltage on the GDO0 pin with an external ADC,

the

temperature

can

calculated.

Specifications for the temperature sensor are

found in Section 4.5 on page 8.

With default PTEST register setting (0x7F) the

temperature sensor output is only available

when the frequency synthesizer is enabled

(e.g. the MANCAL, FSTXON and TX states).

It is necessary to write 0xBF to the PTEST

in the IDLE state. Before leaving the IDLE

state, the PTEST register should be restored to

its default value (0x7F).

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