Using Arduino with PIC32 and ATtiny Atmel Chips - Arduino - page 179

Figure 9-6. Pin layout of the ATtiny 84/44/24

I2C is supported on pin 7, and SDA and SCL are supported on pin 9, as shown in Figure 9-4 .

ATtiny 4313 and 2313
Table 9-4 shows the chip specifications for the ATtiny 4313 and 2313.

Table 9-4. Chip Specifications for the ATtiny 4313 and 2313
Chip Flash EEPROM SRAM PWM ADC Digital I/O

4314 4KB 256 bytes 256 bytes 4 0 18

2313 2KB 128 bytes 128 bytes 4 0 18

Figure 9-7. Pin layout of the ATtiny 4313 and 2313

These chips do not have a standard serial interface, so the normal Arduino bootloader does not work with these
chips. You must manually set the chip configuration in one step, and then you can program the chip using an in-system
programmer. The protocol is SPI.
Each of these chips has the following:

• MISO

• MOSI

• Vcc