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Si4430
Preliminary Rev. 0.4
91
Reset value = 00000000
Register 0Dh. GPIO Configuration 2
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Name
gpiodrv2[1:0]
pup2
gpio2[4:0]
Type
R/W
R/W
R/W
Bit
Name
Function
7:6
gpiodrv2[1:0]
GPIO Driving Capability Setting.
5
pup2
Pullup Resistor Enable on GPIO2.
When set to 1 the a 200 k
resistor is connected internally between VDD and the pin if the
GPIO is configured as a digital input.
4:0
gpio2[4:0]
GPIO2 pin Function Select.
00000: Microcontroller
Clock
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)
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