Rainbow-electronics ATmega128RFA1 Bedienungsanleitung PDF herunterladen (Seite 39)

100

101

8266A-MCU Wireless-12/09

ATmega128RFA1

Figure 9-13. Timing of TRX24_RX_START, TRX24_XAH_AMI, TRX24_TX_END and TRX24_RX_END Interrupts in

Basic Operating Mode

1 2 8 1 6 0 1 9 20 1 9 2 + ( 9 + m ) * 3 2- 1 6 T im e [ µ s ]

(Device 2)

T R X 2 4 _ R X _ S T A R T

IR Q

R X _ O N R X _ O N

I R Q

T R X _ S T A T E

I n te rr u p t la te n c y

T R X 2 4 _

R X _ E N D

T R X 2 4 _ X A H _ A M I

IR Q

B U S Y _ R X

T R X 2 4 _ T X _ E N D

(Device1)

P L L _ O N B U S Y _ T X P L L _ O N

I R Q

S L P T R

T R X _ S T A T E

T y p . P r o c e s s in g D e la y

1 6 µ s

Frame

on Air

P r e a m b le

S F D P H R

M S D U

4 1 1 mN u m b e r o f O c t e ts

F r a m e C o n t e n t M H R

F C S

9.4.1.4 Basic Operating Mode Timing

The following paragraphs depict state transitions and their timing properties. Timing

figures are explained in Table 9-3 on page 42 and section "Digital Interface Timing

Characteristics" on page 507.

9.4.1.4.1 Wake-up Procedure

The wake-up procedure from radio transceiver SLEEP state is shown in Figure 9-14

below. This figure implies, that the microcontroller is already running and hence, the

digital voltage regulator is enabled. If the microcontroller clock source is set to

Transceiver Clock, the crystal oscillator is also running, which reduces the radio

transceiver wake-up time further. For information about the wake-up timing of the

microcontroller, depending on the different clock source options, refer to "System Clock

and Clock Options" on page 147.

In order to calculate the total wake-up delay from microcontroller sleep mode (see

"Power Management and Sleep Modes" on page 156), the microcontroller wake-up

time, including the voltage regulator ramp-up and the radio transceiver wake-up time

has to be added.

Figure 9-14. Wake-up Procedure from Transceiver SLEEP State

Event

State

Block

100

400

Time [µs]

Time

TR2

TRX_OFF

TRX24_AW AKE IRQSLPTR = 0

SLEEP

200

XOSC startup XO SC enabledFTN

The radio transceiver SLEEP state is left by releasing bit SLPTR to “0”. This restarts the

XOSC if it is not already running. After t

TR2

= 215 µs + 25 µs = 240 µs (see Table 9-3 on

page 42) the radio transceiver enters TRX_OFF state. If the XOSC is already running,

the radio transceiver enters TRX_OFF state after 25 µs.

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 523 524

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