LLCC68 datasheet(78/111 Pages) SEMTECH

78 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

78 of 111

Semtech

LLCC68

www.semtech.com

13.2.4 ReadBuffer Function

This function reads (n-3) bytes of payload received starting at offset.

Note: An NOP must be sent after sending the offset.

13.3 DIO and IRQ Control Functions

13.3.1 SetDioIrqParams

This command sets the IRQ flag.

13.3.2 IrqMask

The IrqMask masks or unmasks the IRQ which can be triggered by the device. By default, all IRQ are masked (all ‘0’) and the user can enable

them one by one (or several at a time) by setting the corresponding mask to ‘1’.

13.3.2.1 DioxMask

The interrupt causes a DIO to be set if the corresponding bit in DioxMask and the IrqMask are set. As an example, if bit 0 of IrqMask is set

to 1 and bit 0 of Dio1Mask is set to 1 then, a rising edge of IRQ source TxDone is logged in the IRQ register and appears at the same time on

DIO1.

One IRQ can be mapped to all DIOs, one DIO can be mapped to all IRQs (an OR operation is done) but some IRQ sources are available only

on certain modes of operation and frames.

In total there are 10 possible interrupt sources depending on the chosen frame and chip mode. Each one of them can be enabled or masked.

In addition, every one of them can be mapped to DIO1, DIO2 or DIO3.

Note: If DIO2 or DIO3 are used to control the RF Switch or the TCXO, the IRQ is not generated even if it is mapped to the pins.

A dedicated 10-bit register called IRQ_reg is used to log IRQ sources. Each position corresponds to one IRQ source as described in the table

above. A set of user commands is used to configure IRQ mask, DIOs mapping and IRQ clearing as explained in the following chapters.

Table 13-27: ReadBuffer SPI Transaction

Byte

...

Data from

host

Opcode

= 0x1E

offset

NOP

...

NOP

Data to host

RFU

Status

data@offset

data@offset+1

...

data@offset+(n-3)

Table 13-28: SetDioIrqParams SPI Transaction

Byte

1-2

3-4

5-6

7-8

Data from host

SetDioIrqParams

(0x08)

IrqMask(15:0)

DIO1Mask(15:0)

DIO2Mask(15:0)

DIO3Mask(15:0)

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