CC1110-RTR1 datasheet(61/203 Pages) TI

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CC1110

CC1110 PRELIMINARY Datasheet (Rev. 1.01) SWRS033A

Page 61 of 202

13 Peripherals

In the following sub-sections, each

CC1110

peripheral is described in detail.

The

CC1110 has four timers. These timers all

run on the tick frequency given by the Power

Management

Controller

CLKCON.TICKSPD.

13.1 I/O ports

The

CC1110 has 21 digital input/output pins that

can be configured as general purpose digital

I/O or as peripheral I/O signals connected to

the ADC, Timers or USART peripherals. The

usage of the I/O ports is fully configurable from

user software through a set of configuration

registers.

The I/O ports have the following key features:

•

21 digital input/output pins

•

General purpose I/O or peripheral I/O

•

Pull-up or pull-down capability on

inputs

•

External interrupt capability

The external interrupt capability is available on

all 21 I/O pins. Thus, external devices may

generate interrupts if required. The external

interrupt feature can also be used to wake up

from sleep modes.

13.1.1 General Purpose I/O

When used as general purpose I/O, the pins

are organized as three 8-bit ports, ports 0-2,

denoted P0, P1 and P2. P0 and P1 are

complete 8-bit wide ports while P2 has only

five usable bits. All ports are both bit- and byte

addressable through the SFR registers P0, P1

and P2. Each port pin can individually be set to

operate as a general purpose I/O or as a

peripheral I/O.

The output drive strength is 4 mA on all

outputs, except for the two high-drive outputs,

P1_0 and P1_1, which each have 20 mA

output drive strength.

To use a port as a general purpose I/O pin the

pin must first be configured. The registers

PxSEL where x is the port number 0-2 are

used to configure each pin in a port either as a

general purpose I/O pin or as a peripheral I/O

signal. By default, after a reset, all digital

input/output pins are configured as general-

purpose I/O pins.

By default, all general-purpose I/O pins are

configured as inputs. To change the direction

of a port pin, at any time, the registers PxDIR

are used to set each port pin to be either an

input or an output. Thus by setting the

appropriate bit within PxDIR to 1, the

corresponding pin becomes an output.

When reading the port registers P0, P1 and

P2, the logic values on the input pins are

returned regardless of the pin configuration.

This does not apply during the execution of

read-modify-write

instructions.

The

read-

modify-write instructions when operating on a

port registers are the following: ANL, ORL,

XRL, JBC, CPL, INC, DEC, DJNZ and MOV,

CLR or SETB, when the destination is an

individual bit in a port register P0, P1 or P2.

For these read-modify-write instructions, the

value of the register, not the value on the pin,

is read, modified, and written back to the port

When used as an input, the general purpose

I/O port pins can be configured to have a pull-

up, pull-down or tri-state mode of operation. By

default, after a reset, inputs are configured as

inputs with pull-up. To deselect the pull-

up/pull-down

function

input

the

appropriate bit within the PxINP must be set to

1. The I/O port pins P1_0 and P1_1 do not

have pull-up/pull-down capability.

In power modes PM2 and PM3 the I/O pins

retain the I/O mode and output value (if

applicable) that was set when PM2/3 was

entered.

13.1.2 General Purpose I/O Interrupts

General purpose I/O pins configured as inputs

can be used to generate interrupts. The

interrupts can be configured to trigger on either

a rising or falling edge of the external signal.

Each of the P0, P1 and P2 ports have

separate interrupt enable bits common for all

bits within the port located in the IEN1-2

registers as follows:

•

IEN1.P0IE : P0 interrupt enable

•

IEN2.P1IE : P1 interrupt enable

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