AT86RF231 datasheet(29/180 Pages) ATMEL

29 / 180 page

8111A–AVR–05/08

AT86RF231

6.6

Interrupt Logic

6.6.1

Overview

The AT86RF231 differentiates between nine interrupt events (eight physical interrupt registers,

one shared by two functions). Each interrupt is enabled by setting the corresponding bit in the

interrupt mask register 0x0E (IRQ_MASK). Internally, each pending interrupt is stored in a sepa-

rate bit of the interrupt status register. All interrupt events are OR-combined to a single external

interrupt signal (IRQ, pin 24). If an interrupt is issued (pin IRQ = H), the microcontroller shall read

the interrupt status register 0x0F (IRQ_STATUS) to determine the source of the interrupt. A read

access to this register clears the interrupt status register and thus the IRQ pin, too.

Interrupts are not cleared automatically when the event that caused them vanishes. Exceptions

are IRQ_0 (PLL_LOCK) and IRQ_1 (PLL_UNLOCK) because the occurrence of one clears the

other.

The supported interrupts for the Basic Operating Mode are summarized in Table 6-9 on page

29.

The interrupt IRQ_4 has two meanings, depending on the current radio transceiver state, refer to

After P_ON, SLEEP, or RESET, the radio transceiver issues an interrupt IRQ_4 (AWAKE_END)

when it enters state TRX_OFF.

The second meaning is only valid for receive states. If the microcontroller initiates an energy-

detect (ED) or clear-channel-assessment (CCA) measurement, the completion of the measure-

ment is indicated by interrupt IRQ_4 (CCA_ED_READY), refer to Section 8.4.4 “Interrupt

Handling” on page 92 and Section 8.5.4 “Interrupt Handling” on page 95 for details.

After P_ON or RESET all interrupts are disabled. During radio transceiver initialization it is rec-

ommended to enable IRQ_4 (AWAKE_END) to be notified once the TRX_OFF state is entered.

Table 6-9.

Interrupt Description in Basic Operating Mode

IRQ Name

Description

Section

IRQ_7 (BAT_LOW)

Indicates a supply voltage below the programmed threshold.

Section 9.5.4

IRQ_6 (TRX_UR)

Indicates a Frame Buffer access violation.

Section 9.3.3

IRQ_5 (AMI)

Indicates address matching.

Section 7.2.3.5

IRQ_4 (CCA_ED_READY)

Multi-functional interrupt:

1. AWAKE_END:

• Indicates radio transceiver reached TRX_OFF state after P_ON, RESET, or

SLEEP states.

2. CCA_ED_READY:

• Indicates the end of a CCA or ED measurement.

Section 7.1.2.3

Section 8.4.4

Section 8.5.4

IRQ_3 (TRX_END)

RX: Indicates the completion of a frame reception.

TX: Indicates the completion of a frame transmission.

Section 7.1.3

IRQ_2 (RX_START)

Indicates the start of a PSDU reception. The TRX_STATE changes to BUSY_RX,

the PHR is valid to read from Frame Buffer.

Section 7.1.3

IRQ_1 (PLL_UNLOCK)

Indicates PLL unlock. If the radio transceiver is BUSY_TX / BUSY_TX_ARET

state, the PA is turned off immediately.

Section 9.7.5

IRQ_0 (PLL_LOCK)

Indicates PLL lock.

Section 9.7.5

AT86RF231 Datasheet(PDF) 29 Page - ATMEL Corporation

AT86RF231 Datasheet(HTML) 29 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL