CC2480 datasheet(23/48 Pages) TI

23 / 48 page

CC2480

Peripherals

In the following sub-sections the user-

accessible

CC2480 peripheral modules are

described

detail.

9.1

Reset

The

CC2480 has four reset sources. The

following events generate a reset:

•

Forcing RESET_N input pin low

•

A power-on reset condition

•

A brown-out reset condition

•

firmware-generated

reset

(SYS_RESET_REQ [2])

The initial conditions after a reset are as

follows:

•

I/O pins are configured as inputs with pull-

•

See the

CC2480 Interface Specification [2]

for a description of the interaction between

CC2480 and the host processor after

reset.

9.1.1

Power On Reset and Brown Out Detector

The

CC2480 includes a Power On Reset (POR)

providing correct initialization during device

power-on. Also includes is a Brown Out

Detector (BOD) operating on the regulated

1.8V digital power supply only, The BOD will

protect the memory contents during supply

voltage variations which cause the regulated

1.8V power to drop below the minimum level

required by flash memory and SRAM.

When power is initially applied to the

CC2480

the Power On Reset (POR) and Brown Out

Detector (BOD) will hold the device in reset

state until the supply voltage reaches above

the Power On Reset and Brown Out voltages.

Figure 6 shows the POR/BOD operation with

the 1.8V (typical) regulated supply voltage

together with the active low reset signals

BOD_RESET and POR_RESET shown in the

bottom of the figure (note that signals are not

available, just for illustration of events).

UNREGULATED

1.8V REGULATED

POR RESET ASSERT FALLING VDD

BOD RESET ASSERT

POR RESET DEASSERT RISING VDD

VOLT

POR OUTPUT

BOD RESET

POR RESET

Figure 6 : Power On Reset and Brown Out Detector Operation

9.2

I/O ports

The

CC2480 has digital input/output pins that

have the following key features:

•

General purpose I/O or peripheral I/O

•

Pull-up or pull-down capability on inputs

•

External interrupt capability

Two of the I/O pins have external interrupts

that can be used to wake up the device from

sleep modes.

CC2480 Data Sheet SWRS074

Page 23 of 43

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