ML7344J datasheet(32/151 Pages) ETC2

32 / 151 page

FEDL7344C/E/J-04

ML7344C/E/J

32/151

(1) Format A (Wireless M-BUS)

By setting PKT_FORMAT[1:0] ([PKT_CTRL1: B0 0x04(1-0)])=0b00, Wireless M-BUS Format A is selected.

Format A consists of 1st Block, 2nd Block and Optional Block(s). Each block has 2 bytes of CRC. “L-field” (1st

byte of 1st Block) indicates packet length, which includes subsequenct user data bytes from “C-field”. However,

CRC bytes and postanble are excluded. Depending on “L-field” value, 2nd Block and Optional Block(s) are added.

The following [] indicates register address [bank #, address].

*1: Each mode has different minimum value of n.

*2: Indicates TX FIFO data storage area size.

*3: Indicates RX FIFO data storage area size.

*4: When RXDIO_CTRL[1:0] ([DIO_SET: B0 0x0C(7-6)])=0b10, indicates DCLK/DIO output area.

(*2)

Length

MSB

LSB

Preamble

Sync

Word

TX: automatic insertion

RX: automatic detection, deletion

Manchester/3-out-of-6 applicable [B0 0x07(3-2, 1-0)]

1st Block

2nd Block

Optional Block

Postamble

field

byte

field

byte

field

bytes

field

bytes

CRC

field

bytes

field

byte

CRC

field

bytes

CRC

field

bytes

Data

field

Max.15

bytes

Data

field

Max.16

bytes

0/2-8

bits

10/18/

32bits

> n*2(*1)

bits

CRC applicable

(*2)

(*3)

(*4)

[B0 0x07]

[B0 0x42]

[B0 0x43]

[B0 0x08]

[B1 0x25-2E]

[B0 0x05]

[B0 0x7A/7B, 7D/7E]

[B0 0x44]

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