CC2400-RTR1 datasheet(25/83 Pages) TI

25 / 83 page

CC2400

SWRS042A

Page 25 of 83

21 Microcontroller Interface and Pin Configuration

Used in a typical system,

CC2400 will

interface

microcontroller.

This

microcontroller must be able to:

• Program

CC2400 into different modes

and read back status information via

the

4-wire

SPI-bus

configuration

interface (SI, SO, SCLK and CSn). In

buffered mode the data signal is also

transmitted through the SPI-bus

• Interface

the

bi-directional

synchronous data signal interface (DIO

and

DCLK)

un-buffered

data

transmission is to be used

• Optionally interface to the general

control and status pins (RX, TX, FIFO,

PKT, GIO1 and GIO6) if the hardware

supported packet handling functions

are to be used

• Optionally the microcontroller can

monitor the general I/O pins (GIO1,

GIO6) for frequency lock status, carrier

sense

status,

other

status

information

• Optionally, the microcontroller can read

back digital RSSI value and other

status information via the 4-wire SPI

interface

21.1 Configuration interface

The microcontroller interface is shown in

Figure 8. The microcontroller uses a

minimum of 4 I/O pins for the SPI

configuration interface (SI, SO, SCLK and

CSn). All other pins are optional. SO

should be connected to an input at the

microcontroller. SI, SCLK and CSn must

be microcontroller outputs.

The microcontroller pins connected to SI,

SO and SCLK can be shared with other

SPI-interface devices. SO is a high

impedance output as long as CSn is not

activated (active low).

CSn should have an external pull-up

resistor or be set to a high level during

power down mode in order to prevent the

input from floating. SI and SCLK should be

set to a defined level to prevent the input

from floating.

21.2 Signal interface in un-buffered

mode

A bi-directional pin (DIO) is used for data

to be transmitted and received. DCLK

providing the data timing should be

connected to a microcontroller input.

The data is clocked in/out at the positive

edge of DCLK.

21.3 General control and status pins

Optionally, in buffered mode, the FIFO pin

can

used

interrupt

the

microcontroller at full/empty FIFO. This pin

should

then

connected

microcontroller interrupt pin.

Optionally, using the packet handling

support, the PKT pin can be used in

buffered

mode

interrupt

the

microcontroller when a sync word is

detected (RX mode) and packet is

transmitted (TX mode). This pin should

then be connected to a microcontroller

interrupt pin.

The polarity of FIFO and PKT can be

controlled by the INT register (address

0x23).

Optionally, the RX and TX pins can be

used to change the operating mode of

CC2400 as an alternative to using the SPI

interface strobe commands. These pins

should

then

connected

microcontroller output pins. If the RX and

TX pins are not used, they should be

grounded in order to prevent accidental

change of mode.

Optionally, the GIO1 and GIO6 can be

used to monitor several status signals as

selected by the IOCFG register. The GIO6

should

connected

microcontroller input pin. See Table 18 for

available signals.

Table 15 gives a summary of the possible

pin configurations in the different operation

modes.

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