si4430 Silicon Laboratories, si4430 Datasheet - Page 64

• Manufacturer Part Number: si4430
• Description: Si4430 Ism Transceiver
• Manufacturer: Silicon Laboratories

Si4430
8.8. GPIO Configuration
Three general purpose IOs (GPIOs) are available. Numerous functions such as specific interrupts, TRSW control,
Microcontroller Output, etc. can be routed to the GPIO pins as shown in the tables below. When in Shutdown mode
all the GPIO pads are pulled low.
Note: The ADC should not be selected as an input to the GPIO in Standby or Sleep Modes and will cause excess current con-
The GPIO settings for GPIO1 and GPIO2 are the same as for GPIO0 with the exception of the 00000 default
setting. The default settings for each GPIO are listed below:
The chip is configured to provide the System Clock output to the microcontroller so that only one crystal is needed
in the system, therefore reducing the BOM cost. For the TX Data Source, Direct Mode is used because long
packets are desired with a unique packet handling format already implemented in the microcontroller. In this
configuration the TX Data Clock is configured onto GPIO0, the TX Data is configured onto GPIO1, and the
Microcontroller System Clock output is configured onto GPIO2.
For a complete list of the available GPIO's see “Register 0Ch. GPIO Configuration 1,” on page 90, “Register 0Dh.
GPIO Configuration 2,” on page 91, and “Register 0Eh. I/O Port Configuration,” on page 92.
64
Add R/W Function/Des
0B
0C
0D
0E
sumption.
R/W
R/W
R/W
R/W
Configuration
Configuration
Configuration
Configuration
cription
I/O Port
GPIO0
GPIO1
GPIO2
gpio0drv[1] gpio0drv[0]
gpio1drv[1] gpio1drv[0]
gpio2drv[1] gpio2drv[0]
D7
GPIO0
GPIO1
GPIO2
GPIO
extitst[2]
D6
Preliminary Rev. 0.4
extitst[1] extitst[0]
pup0
pup1
pup2
D5
00000—Default Setting
Microcontroller Clock
gpio0[4] gpio0[3] gpio0[2] gpio0[1] gpio0[0]
gpio1[4] gpio1[3] gpio1[2] gpio1[1] gpio1[0]
gpio2[4] gpio2[3] gpio2[2] gpio2[1] gpio2[0]
POR Inverted
D4
POR
itsdo
D3
dio2
D2
dio1
D1
dio0
D0
POR Def.
00h
00h
00h
00h