The I/O Ports section tells us that each port pin consists of 3 register bits: DDxn, PORTxn and PINxn. From the Electrical Characteristics section, we know that each I/O pin can source or sink a max of 40 mA. We also know that the port pins are tri-stated when the MCU undergoes a reset. PB3 can be used as an I/O pin instead of RESET and this is done by programming a 0 into the RSTDISBL fuse. We know that Port B (PB0:3) and Port A (PA0:7) are bit programmable, bi-directional I/O ports with internal pull-up resistors. The detailed datasheet contains a lot of very useful information about the microcontroller.

If I'm design a part for use in space, where temperatures fall to 0 Kelvin (-273 degC), I wouldn't use this part because it is only rated for temperatures between -40 to 85 degC. There are 12 programmable I/O lines on the MCU and it can operate with supply voltages from 1.8 - 5.5V, with operation at higher frequencies requiring higher supply voltages. We know that the IC is available in different packaging, ranging from 14-pin SOIC or PDIP to 20-pin VQFN.

The datasheet also lists the peripherals available on this IC, such as timer/counters, pwm channels, ADCs, analog comparators and serial interfaces. We also know that the MCU can retain its memory for 20 years at 85 degC and 100 years at 25 degC. For instance, we know that there are 3 versions of the MCU - the ATtiny24A, ATtiny44A and ATtiny84A, all with the same architecture and feature set, but with different amounts of flash memory. The information from the datasheet is very useful for learning about the microcontroller. To really understand the microcontroller, you would need to read the full datasheet. The summary document contains the main features of the MCU, the pinout diagram, architecture overview, register summary, assembly instruction set and packaging information, but doesn't describe the microcontroller features in detail. There is also a 26-page summary datasheet. There are many versions of the document, ranging from 196 to 286 pages. The datasheet is available online from the Atmel site. Since this board is based on the ATtiny44 microcontroller, I started with the Atmel datasheet for this device. program the hello board to do something, with different programming languages and programming environmentsĭuring the Electronics Design week, I modified Neil's hello.ftdi.44 board by adding a pushbutton switch and an led.learn to read a microcontroller datasheet.

Exercise 08 - Embedded Programming Assignmentįor this week's assignment, we are supposed to:

Arduino uno atmega328 adiw datasheet