USER MANUAL
STM 550B / EMSIB - EASYFIT MULTISENSOR FOR IOT APPLICATIONS (2.4 GHZ BLE)
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F-710-017, V1.0
STM 550B / EMSIB User Manual | v1.3 | June 2020 | Page 60 / 115
9.5.3
NFC_PIN_CODE
The PIN code used to protect access to the NFC CONFIGURATION memory area should be
changed from the default value to a user-specific value to avoid unauthorized access to the
device configuration.
To do so, first authenticate with the current PIN code and then write the new PIN code (32
bit value) to the NFC_PIN_CODE register.
9.5.4
SOURCE_ADDRESS
Each STM 550B module uses a unique 6 byte address (Static Source Address) to identify its
messages. This address is assigned during manufacturing.
The two most significant byte of this address are always 0xE500; i.e. the address always
starts with 0xE500. The four least significant byte of this address can be read from the
SOURCE_ADDRESS register.
The 6 byte address can then be calculated as (0xE500 << 32) + SOURCE_ADDRESS
9.5.5
CH_REG1, CH_REG2, CH_REG3
The channel selection registers CH_REG1, CH_REG2 and CH_REG3 define the radio chan-
nels used for custom radio transmission sequences as described in chapter 5.3.
The encoding of the radio channels follows the definition listed in Table 5; their default set-
tings are listed in Table 12 below.
Default Values
CH_REG1
0x25 (CH 37)
CH_REG2
0x26 (CH 38)
CH_REG3
0x27 (CH 39)
Table 12
–
Default settings for CH_REG1, CH_REG2 and CH_REG3
9.5.6
TX_CFG
The transmission configuration register TX_CFG identifies the custom radio transmission se-
quence type (encoded by the bit field CHANNEL_MODE) and the data rate (encoded by the
bit field DATA_RATE).
TX_CFG (Default Setting: 0x00)
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
RFU
DATA_RATE
CHANNEL_MODE
Figure 41
–
TX_CFG register
