Manual

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RF22

Version: 0.1 Date: 12/23/2008

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01111: TX/RX Data CLK output to be used in conjunction with TX/RX Data pin (output)

10000: TX Data input for direct modulation (input)

10001: External Retransmission Request (input)

10010: TX State (output)

10011: TX FIFO Almost Full (output)

10100: RX Data (output)

10101: RX State (output)

10110: RX FIFO Almost Full (output)

10111: Antenna 1 Switch used for antenna diversity (output)

11000: Antenna 2 Switch used for antenna diversity (output)

11001: Valid Preamble Detected (output)

11010: Invalid Preamble Detected (output)

11011: Sync Word Detected (output)

11100: Clear Channel Assessment (output)

11101: VDD

else : GND

Bit D7 D6 D5 D4 D3 D2 D1 D0

Name gpiodrv1[1:0] pup1 gpio1[4:0]

Type R/W R/W R/W

Reset value = 00000000

Bit Name Function

7:6 gpiodrv1[1:0] GPIO Driving Capability Setting.

5 pup1 Pullup Resistor Enable on GPIO1.

When set to 1 the a 200k resistor is connected internally between VDD and the pin if the GPIO

is configured as a digital input.

4:0 gpio1[4:0] GPIO1pin Function Select.

00000: Power-On-Reset (output)

00001: Wake-Up Timer: 1 when WUT has expired (output)

00010: Low Battery Detect: 1 when battery is below threshold setting (output)

00011: Direct Digital Input

00100: External Interrupt, falling edge (input)

00101: External Interrupt, rising edge (input)

00110: External Interrupt, state change (input)

00111: ADC Analog Input

01000: Reserved (Analog Test N Input)

01001: Reserved (Analog Test P Input)

01010: Direct Digital Output

01011: Reserved (Digital Test Output)

01100: Reserved (Analog Test N Output)

01101: Reserved (Analog Test P Output)

01110: Reference Voltage (output)