Specifications

PWM
Six pins can optionally be used as Pulse Width Modulation (PWM) outputs: pins 2-4 (GPIO_0-
GPIO_2), pins 7 and 8 (GPIO_5 and GPIO_6), and pin 22 (GPIO_19).
Pin Configuration of an ATmega128RFA1 in SNAP Engine Format (RF200)
EnginePin SNAPpyIO Name Description
1 GND PowerSupply
2 7 GPIO0OC0AOC1CPCINT7PB7 GPIO_0orPWMorInterrupt
3 6 GPIO1OC1BPCINT6PB6 GPIO_1orPWMorInterrupt
4 5 GPIO2OC1APCINT5PB5 GPIO_2orPWMorInterrupt
5 16 GPIO3RXD0PCINT8PE0 GPIO_3orUART0DataInorInterrupt
6 17 GPIO4TXD0PE1 GPIO_4orUART0DataOut
7 20 GPIO5OC3BINT4PE4 GPIO_5orUART0CTSOutputorPWMorInterrupt
8 21 GPIO6OC3CINT5PE5 GPIO_6orUART0RTSInputorPWMorInterrupt 
9 10 GPIO7RXD1INT2PD2 GPIO_7orUART1DataInorInterrupt
10 11 GPIO8TXD1INT3PD3 GPIO_8orUART1DataOutorInterrupt
11 12 GPIO9CTS1ICP1PD4 GPIO_9orUART1CTSoutputorInputCapture
12 23 GPIO10RTS1ICP3INT7CLKO GPIO_10orUART1RTSinputorClockOutputBufferor
Interrupt
13 24 GPIO11ADC0PF0 GPIO_11orAnalog0
14 25 GPIO12ADC1MOSIPF1 GPIO_12orAnalog1orSPIMOSI
15 26 GPIO13ADC2DIG2SCLKPF2 GPIO_13orAnalog2orSPICLKorAntennaDiversityControl
16 18 GPIO14XCK0AIN0MISOPE2 GPIO_14orSPIMISOorAnalogComparatororExternal
Clock
9
17 28 GPIO15ADC4TCKPF4 GPIO_15orAnalog4orJTAGTestClock
18 29 GPIO16ADC5TMSPF5 GPIO_16orAnalog5orJTAGTestModeSe ctle
19 30 GPIO17ADC6TDOSDAPF6 GPIO_17orAnalog6orJTAGTestDataOutor
2
CSDAI
20 31 GPIO18ADC7TDISCLPF7 GPIO_18orAnalog7orJTAGTestDataInorI CSCL
2
21 VCC PowerSupply
22 19 GPIO19OC3AAIN1PE3 “GPIO_19”orAn PWMorOutputalogComparatoror
10
CompareMatch
23 RESET* ModuleReset,ActiveLow
24 GND PowerSupply
9
On RF200 SNAP Engines with no power amplifier, pin 16 (GPIO_14) provides Analog3 (ADC3/PF3) instead of the
characteristics of PE2. Analog3 is unavailable on RF200 SNAP Engines with a power amplifier.
10
Other SNAP Engines have a debug connection on pin 22. The architecture of the RF200 requires multiple debug
connections, which come out on other pins. Rather than leave pin 22 useless, it is available as an additional GPIO or
Analog Comparator. This will not be directly accessible on Synapse development boards, but custom circuit designs have
the pin available for specialized purposes.
SNAP Reference Manual Document Number 600-0007K Page 163 of 202