CC1010-RTR1 datasheet(35/152 Pages) TI

35 / 152 page

CC1010

SWRS047

Page 35 of 152

Mode

Core

Peripherals

Typical current

consumption

Exit condition

Main osc.

14.8 mA at

14.7456 MHz

Writing SFR

Active

RTC osc.

(32 kHz)

RTC osc.

(32 kHz)

1.3 mA

Writing SFR

Stopped

Main osc.

12.8 mA at

14.7456 MHz

Idle

Stopped

RTC osc.

(32 kHz)

ADC Off

29.4 uA

Interrupt

Reset

Power off/on

Stopped

ADC On

(32 kHz)

200 uA

ADC value exceeds threshold

Reset

Power off/on

Power-Down

Stopped

0.2 uA

Reset

Power off/on

Note 1: Flash duty-cycle reduction is used for all modes

Table 15. Operating modes summary

15.9.4

Clock Modes

The 8051 and its peripherals can be run

on both the main crystal oscillator (Clock

Mode 0) and the 32.768 kHz oscillator

(Clock Mode 1). The clock mode is set in

X32CON.CMODE.

15.9.5

Entering Clock Mode 1 from

Clock Mode 0

After reset, the 8051 and its peripherals

are running on the main crystal oscillator,

and the 32.768 kHz oscillator is in power

down. To enter Clock Mode 1, the 32.768

kHz oscillator must first be powered up.

This requires clearing X32CON.X32_PD

and then waiting at least 160 ms, after

which X32CON.CMODE can be set to enter

Clock Mode 1.

If an external 32.768 kHz clock source is

already available in the system, this clock

can be applied to the XOSC32_Q1 pin after

setting the X32CON.X32_BYPASS bit.

After 2 to 3 clock periods on the 32.768

kHz oscillator, a glitch free transition has

been made from the main crystal oscillator

to the 32.768 kHz oscillator. If desired, the

main crystal oscillator can then be set in

power down to save more power by

setting

RFMAIN.CORE_PD

and

RFMAIN.BIAS_PD.

This

has

the

disadvantage that a later transition from

Clock Mode 1 to Clock Mode 0 will require

the main crystal oscillator to be powered

up again.

Since the Flash program memory draws a

static current, Idle Mode together with

Flash Power Control (see page 44) should

be applied for maximum power saving in

Clock Mode 1.

The RF receiver cannot be activated in

Clock Mode 1.

15.9.6

Entering Clock Mode 0 from

Clock Mode 1

To enter Clock Mode 0 from Clock Mode

1, the main crystal oscillator must first be

set in power up (if powered down). This

requires clearing RFMAIN.CORE_PD and

RFMAIN.BIAS_PD and then waiting at

least 5 ms (depend on main oscillator

frequency, see Electrical Specifications

page 7). If the oscillator is already

powered up, no waiting is required.

Clearing X32CON.CMODE will then cause a

glitch free transition from Clock Mode 1 to

Clock Mode 0 after 2 to 3 clock periods on

the main crystal oscillator.

15.9.7

Flash Power Control

The Flash program memory current

consumption

can

controlled

described in the Flash Power Control

section on page 44.

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