UT.6.01

C1 Bevezetés

Folyamatosan gyűjtöm az anyagokat és fordítom, ahogy lehet

C2 Alap fogalmak

Hexadecimális számok

Hex Digit	Decimal  Value	Binary Value
0	0	0000
1	1	0001
2	2	0010
3	3	0011
4	4	0100
5	5	0101
6	6	0110
7	7	0111
8	8	1000
9	9	1001
A or a	10	1010
B or b	11	1011
C or c	12	1100
D or d	13	1101
E or e	14	1110
F or f	15	1111

Beágyazott rendszerek

Processzor típusok: x86 (ált. asztali gép), ARM.
"Az I/O az a ragasztó, amivel a processzor kapcsolódik a világhoz."
Tervezési szempontok: tesztelhetőség, haszon, energia igény, méret, megfelelő válasz megfelelő időben.
Human-computer interface (HCI) or man-machine interface (MMI).
Tipikus példa: multiméter.

Bevezetés a számítógépekhez

Neumann architecture

Számítógép = proceszor + RAM + ROM + IO.
Neumann architecture, "A port is a physical connection between the computer and its outside world. Ports allow information to enter and exit the system."
"A bus is a collection of wires used to pass information between modules."

A busz vezetékek gyűjteménye, amit a modulok közti információ cserére használunk.

Harvard architecture

ARM®Cortex™-M processor. "separate data and instruction buses"

Külön adat, és utasítás buszok.

"The nested vectored interrupt controller (NVIC) manages interrupts, which are hardware-triggered software functions. " A beágyazott irányítható megszakítás-vezérlő - NVIC

CPU regiszterek

ISA Instruction set architecture

MEMORY MAP LAYOUT

RAM (random access memory)

ROM (read only memory)
ROM-ok:

Static RAM (SRAM)

Programmable ROM (PROM) 10000 times slower RAM

Electrically erasable programmable ROM (EEPROM)

"In regular EEPROM, you can erase and program individual bytes. "

FLASH ROM

"Flash ROM is a popular type of EEPROM. Each flash bit requires only two MOSFET transistors. The input (gate) of one transistor is electrically isolated, so if we trap charge on this input, it will remain there for years."

"Each flash bit requires only two MOSFET transistors The input (gate) of one transistor is electrically isolated, so if we trap charge on this input, it will remain there for years. The other transistor is used to read the bit by sensing whether or not the other transistor has trapped charge."

"Flash ROM must be erased in large blocks. On many of Stellaris family of microcontrollers, we can erase the entire ROM or just a 1024-byte block."

"Because flash is smaller than regular EEPROM, most microcontrollers have a large flash into which we store the software. For all the systems in this class, we will store instructions and constants in flash ROM and place variables and temporary data in static RAM."

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A microprocessor is a small processor.

A microcomputer is a small computer that includes a processor, memory and I/O devices.

A microcontroller is a single chip computer.

Flash ROM is higher density because it requires few transistors compared to RAM.

Software

CortexM_InstructionSet.pdf Instruction Set Reference Manual https://courses.edx.org/c4x/UTAustinX/UT.6.01x/asset/CortexM_InstructionSet.pdf

CortexM4_TRM_r0p1.pdf Cortex-M4 Technical Reference Manual https://courses.edx.org/c4x/UTAustinX/UT.6.01x/asset/CortexM_InstructionSet.pdf

LaunchPadUsersManual.pdf LaunchPad Manual

tm4c123gh6pm.pdf Data Sheet for the TM4C123 microcontroller

C3.2

elemekre E = V * I * time

E-> állandó ; V -> állandó, az idő vagy az I csökkentésével csökkenthetjük a felhasznált energiát

P = V * I Power = Voltage  * Current

P = V2 / R Power = Voltage2 / Resistance           

P = I2 * R Power = Current2 * Resistance