SPIRIT1 datasheet(57/94 Pages) STMICROELECTRONICS

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SPIRIT1

Transmission and reception

Doc ID 022758 Rev 3

57/94

The sub-mode can be chosen setting the MBUS_SUBMODE[2:0] field of the MBUS_CTRL

●

Submode S1, S2 (long header) (MBUS_SUBMODE=0):

–

Header length = MBUS_PRMBL_CTRL + 279 (in '01' bit pairs)

–

Sync word = 0x7696 (length 18 bits)

●

Submode S1-m, S2, T2 (other to meter) (MBUS_SUBMODE =1):

–

Header length = MBUS_PRMBL_CTRL + 15 (in '01' bit pairs)

–

Sync word = 0x7696 (length 18 bits)

●

Submode T1, T2 (meter to other) (MBUS_SUBMODE =3):

–

Header length = MBUS_PRMBL_CTRL + 19 (in '01' bit pairs)

–

Sync word = 0x3D (length 10 bits)

●

Submode R2, short header (MBUS_SUBMODE =5):

–

Header length = MBUS_PRMBL_CTRL + 39 (in '01' bit pairs)

–

Sync word = 0x7696 (length 18 bits).

●

Submode N1, N2, short header:

–

Header length = 8 (in '01' bit pairs)

–

Sync word = 0xF68D (length 18 bits).

9.7.3

Basic packet

Preamble (programmable field): the length of the preamble is programmable from 1 to 32

bytes by the PREAMBLE_LENGTH field of the PCKTCTRL2 register. Each preamble byte is

a '10101010' binary sequence.

Sync (programmable field): the length of the synchronization field is programmable (from 1

to 4 bytes) through dedicated registers. The synchronization word is programmable through

registers SYNC1, SYNC2, SYNC3, and SYNC4. If the programmed sync length is 1, then

only SYNC word is transmitted; if the programmed sync length is 2 then only SYNC1 and

SYNC2 words are transmitted and so on.

Length (programmable/optional field): the packet length field is an optional field that is

defined as the cumulative length of Address, Control, and Payload fields. It is possible to

support fixed and variable packet length. In fixed mode, the field length is not used.

Destination address (programmable/optional field): when the destination address filtering

is enabled in the receiver, the packet handler engine compares the destination address field

of the packet received with the value of register TX_SOURCE_ADDR. If broadcast address

and/or multicast address filtering are enabled, the packet handler engine compares the

destination address with the programmed broadcast and/or multicast address.

Control (programmable/optional field): is programmable from 0 to 4 bytes through the

CONTROL_LEN field of the PCKTCTRL4 register. Control fields of the packet can be set

using the TX_CTRL_FIELD[3:0] register.

Payload (programmable/optional field): the device supports both fixed and variable payload

length transmission from 0 to 65535 bytes.

1-32

1-4

0-16 bit

0-1

0-4

0-65535

0-3

Preamble

Sync

Length

Address

Control

Payload

CRC

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