CC1010-RTR1 datasheet(34/152 Pages) TI

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CC1010

SWRS047

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15.9 Power and Clock Modes

Several power modes are defined to save

power when running

CC1010. The modes

are described below. See also Table 15.

15.9.1

Active Mode

In active mode the 8051 is running

normally, executing instructions from the

Flash program memory. The clock used in

this mode could either be the main crystal

oscillator, or it could be the 32 kHz

oscillator.

The

current

consumption

depends on the actual frequency used.

15.9.2

Idle Mode

After completing the instruction that sets

the PCON.IDLE bit, Idle Mode is entered.

In Idle Mode, the 8051 processing is

stopped and internal registers maintain

their current data, but all peripherals are

still running.

There are 3 ways to exit Idle Mode:

•

Activate any enabled interrupt. This

clears the IDLE bit, terminating Idle

Mode,

and

executes

the

ISR

associated with the received interrupt.

The RETI instruction at the end of the

ISR causes the 8051 to return to the

instruction following the one that

enabled Idle Mode.

•

Activate any reset condition. All

registers are then reset, and program

execution will resume from address

0x0000 when the reset condition is

cleared.

•

Turn the power off and on. The Power

On Reset module should then be

enabled, or an external reset signal

should be applied during power up.

15.9.3

Power-Down Mode

After completing the instruction that sets

the PCON.STOP bit, the controller core and

the peripherals are stopped. In Power-

Down Mode, the clock trees of the 8051

and peripherals are disabled. Only the

ADC clock tree is running. This enables

the ADC to generate reset as will be

described in the ADC section.

Note that the PCON.STOP bit does not

affect the clock oscillators; these will still

be running if they are switched on when

entering Power-Down Mode.

To ensure minimum power-consumption,

the ADC should be switched off and

Power-down mode should be entered by

switching off the oscillators instead of

using the PCON.STOP bit.

There are 2 ways to exit Power Down

Mode:

•

Activate any reset condition. All

registers are then reset, and program

execution will resume when the reset

condition

cleared.

Program

execution will then resume from

address 0x0000.

•

Turn the power off and on. The Power

On Reset module should then be

enabled, or an external reset signal

should be applied during power up.

More information about minimising the

power consumption of the CC1010 can be

found in Application Note AN017 Low

Power Systems Using The CC1010.

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