ML7344CE datasheet(43/154 Pages) LAPIS

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FEDL7344C/E/J-05

ML7344C/E/J

43/154

●Field check function

ML7344 has the function of comparing the 9 bytes following L-field (Format A/B: start from C-field, Format

C: start from Data-field) in a receiving packet. Based on comparison with the expected data, possible to

generate interrupts (Field check function). Field check can be possible with the following register setting. When

using this function, RXDIO_CTRL [1:0] ([DIO_SET:B0 0x0C(7-6)]) = 0b00 (FIFO mode) or 0b11 (data

output mode 2) setting is required.

Function

RX data process setting when Field check unmatched

[C_CHECK_CTRL: B0 0x1B(7)]

Field check interrupt setting

[C_CHECK_CTRL: B0 0x1B(6)]

C-field detection enable setting

[C_CHECK_CTRL: B0 0x1B(4-0)]

M-field detection enable setting

[M_CHECK_CTRL: B0 0x1C(3-0)]

A-field detection enable setting

[A_CHECK_CTRL: B0 0x1D(5-0)]

C-field code setting

[C_FIELD_CODE1: B0 0x1E]

[C_FIELD_CODE2: B0 0x1F]

[C_FIELD_CODE3: B0 0x20]

[C_FIELD_CODE4: B0 0x21]

[C_FIELD_CODE5: B0 0x22]

M-field code setting

[M_FIELD_CODE1: B0 0x23]

[M_FIELD_CODE2: B0 0x24]

[M_FIELD_CODE3: B0 0x25]

[M_FIELD_CODE4: B0 0x26]

A-field code setting

[A_FIELD_CODE1: B0 0x27]

[A_FIELD_CODE2: B0 0x28]

[A_FIELD_CODE3: B0 0x29]

[A_FIELD_CODE4: B0 0x2A]

[A_FIELD_CODE5: B0 0x2B]

[A_FIELD_CODE6: B0 0x2C]

The following describes the relation between each comparison code and incoming RX data.

[Format A/B(Wireless M-Bus)]

Field check can be controlled by setting disabled/enabled for each comparison code (1 byte). If all specified

Field data (C-field/M-field/A-field) are matched, Field checking matching will be notified. However, if C-field

data and C_FIELD_CODE5 are matched, even if other Field data (M-field/A-field) are not matched, Field check

result will be notified as ”match”.

MSB

Preamble

Sync

Word

field

1st Block

field

byte

bytes

10/18/

32bits

Over n*2

bit

bytes

CRC

field

0/2

bytes

C1: [C_FIELD_CODE1: B0 0x1E]

C2: [C_FIELD_CODE2: B0 0x1F]

C3: [C_FIELD_CODE3: B0 0x20]

C4: [C_FIELD_CODE4: B0 0x21]

C5: [C_FIELD_CODE5: B0 0x22]

A1. [A_FIELD_CODE1: B0 0x27]

A2. [A_FIELD_CODE2: B0 0x28]

A3. [A_FIELD_CODE3: B0 0x29]

A4. [A_FIELD_CODE4: B0 0x2A]

A5. [A_FIELD_CODE5: B0 0x2B]

A6. [A_FIELD_CODE6: B0 0x2C]

LSB

M1. [M_FIELD_CODE1: B0 0x23]

M2. [M_FIELD_CODE2: B0 0x24]

M3. [M_FIELD_CODE3: B0 0x25]

M4. [M_FIELD_CODE4: B0 0x26]

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