User's Manual

FLC-BTM101 Datasheet

Flaircomm Microelectronics Confidential

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5. Serial Interfaces

5.1 UART

This is a standard UART interface for communicating with other serial devices. The UART interface

provides a simple mechanism for communicating with other serial devices using the RS232 protocol.

When the module is connected to another digital device, UART_RX and UART_TX transfer data

between the two devices.

When selected in firmware PIO[0] is assigned to UART_TX and PIO[1] is assigned to UART_RX.

The UART CTS and RTS signals can be assigned to any PIO pin by the on-chip firmware.

Parameter

Possible Values

Baud Rate

Minimum

1200 baud (≤2%Error)

9600 baud (≤1%Error)

Maximum

4M baud (≤1%Error)

Flow control

CTS / RTS

Parity

None, Odd or Even

Number of Stop Bits

1 or 2

Bits per Byte

Table 5: Possible UART Settings

5.1.1 UART Configuration While in Deep Sleep

The maximum baud rate is 9600 baud during deep sleep.

5.2 I

C Interface

The I

C interface communicates to an internal EEPROM, or external peripherals or sensors. The

internal EEPROM holds the program code inside BTM101.

Figure 3 shows the connection of the internal EEPROM with the I

C interface where I2C_SCL,

I2C_SDA and PIO [2] are connected to the internal EEPROM. The PIO [2] pin supplies the power to

the EEPROM supply pin, e.g. VDD. At boot-up, if there is no valid ROM image in the BTM101

ROM area, BTM101 tries to boot from the I

C interface, see Figure 4. This involves reading the

code from the internal EEPROM and loading it into the internal BTM101 RAM.