Microchip Technology ATtiny3217 Xplained Pro, Manual

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EXT1 Pin ATtiny3217 Pin Function Shared Functionality
8 [PWM(-)] PB1 TC/W1 -
9 [IRQ/GPIO] PA5 IRQ/GPIO -
10 [SPI_SS_B/GPIO] PA4 GPIO -
11 [I²C_SDA] PA1 I²C SDA EXT3 and EDBG I²C
12 [I²C_SCL] PA2 I²C SCL EXT3 and EDBG I²C
13 [USART_RX] PB3 UART RX EXT3 , EDBG CDC , and Crystal
( 1 )
14 [USART_TX] PB2 UART TX EXT3 , EDBG CDC , and Crystal
( 1 )
15 [SPI_SS_A] PC3 SPI SS -
16 [SPI_MOSI] PC2 SPI MOSI EXT3 and EDBG SPI
17 [SPI_MISO] PC1 SPI MISO EXT3 and EDBG SPI
18 [SPI_SCK] PC0 SPI SCK EXT3 and EDBG SPI
19 [GND] - - Ground
20 [VCC] - - Power for extension board
1) Not connected by default, see 4.5.1 Connecting the 32.768 kHz Crystal for more information.
Note: Signal functions in italic use alternative pin location. These have to be configured in the PORTMUX register of
the device.
Table 4-2. Extension Header EXT3
EXT3 Pin ATtiny3217 Pin Function Shared Functionality
1 [ID] - - Communication line to the ID chip on an extension board
2 [GND] - - Ground
3 [ADC(+)] - -
4 [ADC(-)] - -
5 [GPIO1] PC5 GPIO SW1 and UPDI debug connector
6 [GPIO2] - -
7 [PWM(+)] - -
8 [PWM(-)] - -
9 [IRQ/GPIO] PB6 IRQ/GPIO EDBG DGI
10 [SPI_SS_B/GPIO] PB5 GPIO SW0 and EDBG DGI
11 [I²C_SDA] PA1 I²C SDA EXT1 and EDBG I²C
12 [I²C_SCL] PA2 I²C SCL EXT1 and EDBG I²C
13 [USART_RX] PB3 UART RX EXT1 , EDBG CDC , and Crystal
( 1 )
14 [USART_TX] PB2 UART TX EXT1 , EDBG CDC , and Crystal
( 1 )
15 [SPI_SS_A] PA3 GPIO / SPI_SS -
16 [SPI_MOSI] PC2 SPI MOSI EXT1 and EDBG SPI
17 [SPI_MISO] PC1 SPI MISO EXT1 and EDBG SPI
ATtiny3217 Xplained Pro
Hardware User Guide
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2020 Microchip Technology Inc.
User Guide
DS50002765B-page 14