Please consider this device

The PIC12LF1840T48A is not recommended for new designs.  As an alternative, we recommend the .

Low Power PICmicro® with fully integrated RF Transmitter capable of operation in 418, 434 and 868 MHz Bands

  Enhanced Mid-range Core with 49 Instruction, 16 Stack Levels

  Flash Program Memory with self read/write capability

  Internal 32MHz oscillator

  Data Signal Modulator Module

  MI2C, SPI, EUSART w/auto baud

  ECCP (Enhanced/Capture Compare PWM) Module

  Comparator with selectable Voltage Reference

  4 Channel 10b ADC with Voltage Reference

  25mA Source/Sink current I/O

  Two 8-bit Timers (TMR0/TMR2)

  One 16-bit Timer (TMR1)

  Extended Watchdog Timer (EWDT)

  Enhanced Power-On/Off-Reset

  Brown-Out Reset (BOR)

  In Circuit Serial Programming (ICSP)

  On Board In-Circuit Debug

  Fully Integrated Transmitter

  FSK Operation up to 100 kbps

  OOK Operation up to 10 kbps

  Operation in 418, 434 and 868 MHz Bands:

  8 Selectable center frequencies

  +10 dBm or 0 dBm Configurable Output Power:

  Up to 100 kbps bit rate in FSK, 10 kbps bit rate in OOK

  Standby Current:

  30 nA @ 3.0V, typical, RF off

  530 nA @ 3.0V, typical, RF Sleep

  Operating Current:

  0.67 mA @ 8 MHz, 3.0V, RF off, typical

  9.67 mA @ 8 MHz, 3.0V, RF on at 0 dBm, typical

  17.17 mA @ 8 MHz, 3.0V, RF on at 10 dBm, typical

  Low-Power Watchdog Timer Current:

  500 nA @ 3.0V, typical