TRM-915-R250-CFT datasheet(28/39 Pages) LINX

28 / 39 page

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CMD Halts Traffic- Address = 0x6E; NV Address = 0x23

When configuring the module’s register settings, it is possible that incoming

RF transmissions can intermix with the module’s response, making it

difficult to determine if your commands were successfully processed.

Changing this register setting to 0x01 causes the module to store incoming

RF traffic (up to the RF buffer overflow) while the CMD line is low. When the

CMD line is returned high, the module outputs all buffered data.

Figure 57 shows examples of the commands and Figure 58 shows the

available values.

Figure 57: 250 Series Transceiver CMD Halts Traffic Command and Response

250 Series CMD Halts Traffic Register Settings

Mode

0x00

Disable Halt

0x01

Enable Halt

Figure 58: 250 Series CMD Halts Traffic Register Settings

250 Series CMD Halts Traffic

Read Command

Read Response

Header

Size

Escape

Address

ACK

Address

Value

0xFF

0x02

0xFE

0x6E

0x23

0x06

0x6E

0x23

Write Command

Header

Size

Address

Value

0xFF

0x02

0x6E

0x23

Exception Mask - Address = 0x6C; NV Address = 0x21

The module has a built-in exception engine that can notify the host

processor of an unexpected event. When an exception occurs, this register

is ANDed with the exception code. A non-zero result causes the EX line to

be asserted. Reading the regEXCEPTION register clears the exception and

resets the EX line. If the result is zero, the EX line is not asserted but the

exception code is stored in the regEXCEPTION register.

Figure 55 shows examples of the commands and Figure 56 shows the

available values.

Figure 55: 250 Series Transceiver Exception Mask Command and Response

250 Series Example Exception Masks

Exception Name

0x08

Allows only EX_BUFOVFL and EX_RFOVFL to trigger the EX line

0x10

Allows only EX_WRITEREGFAILED to trigger the EX line

0x20

Allows only EX_NORFACK to trigger the EX line

0x40

Allows only EX_BADCRC, EX_BADHEADER, EX_BADSEQID and EX_

BADFRAMETYPE exceptions to trigger the EX line

0x60

Allows EX_BADCRC, EX_BADHEADER, EX_BADSEQID, EX_BADFRAMETYPE

and EX_NORFACK exceptions to trigger the EX line

0xFF

Allows all exceptions to trigger the EX line

Figure 56: 250 Series Transceiver Example Exception Masks

250 Series Exception Masks

Read Command

Read Response

Header

Size

Escape

Address

ACK

Address

Value

0xFF

0x02

0xFE

0x6C

0x21

0x06

0x6C

0x21

Write Command

Header

Size

Address

Value

0xFF

0x02

0x6C

0x21

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