First what is a microcontroller? It is is a small computer on a single integrated circuit containing a processor core, memory, and programmable input/output peripherals. Program memory in the form of NOR flash or OTP ROM is also often included on chip, as well as a typically small amount of RAM. Microcontrollers are designed for embedded applications, in contrast to the microprocessors used in personal computers or other general purpose applications.(Wikipedia)
Today, we have more than 30 microcontroller manufacturers with many microcontroller products in the world today. They are listed below:
AMCC
PowerPC 403
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PowerPC 405
PowerPC 440
Altera
Nios II 32-bit configurable soft microprocessor
Nios 16-bit configurable soft processor
Analog Devices
ADSP-21xx digital signal processor
MicroConverter series – ARM7 and 8052 cores
Atmel
AT89 series
AT90, ATtiny, ATmega, ATxmega series
AT91SAM (ARM architecture)
AVR32 (32-bit AVR architecture)
MARC4
Charmed Labs
Qwerk
XPort
Cypress Semiconductor
CY8C2xxxx
CY8C3xxxx
CY8C5xxxx
Dallas Semiconductor
8051 Series
MAXQ series
Secure Micros series
ELAN Microelectronics Corp.
EM78PXXX Low Pin-Count series
EM78PXXXN GPIO series
EM78PXXXN ADC Type MCU series
Energy Micro AS
Standard microcontrollers
Application specific microcontrollers
Custom microcontrollers
EPSON Semiconductor
4-bit Microcomputers S1C60/62/63 family
8-bit Microcomputers S1C88 family
16-bit Microcomputers S1C17 family
32-bit Microcomputers S1C33 family
Freescale Semiconductor
8-bit
68HC05 (CPU05)
68HC08 (CPU08)
68HC11 (CPU11)
16-bit
68HC12 (CPU12)
68HC16 (CPU16)
Freescale DSP56800 (DSPcontroller)
32-bit
Freescale 683XX
M·CORE
MPC500
MPC 860 (PowerQUICC)
MPC 8240/8250 (PowerQUICC II)
MPC 8540/8555/8560 (PowerQUICC III)
Fujitsu
F²MC Family (8/16-bit)
FR Family (32-bit)
FR-V Family (32-bit RISC)
Holtek
HT48FXX Flash I/O type series
HT48RXX I/O type series
HT46RXX A/D type series
HT49RXX LCD type series
HT82XX Computer Peripheral series
HT95XX Telecom Peripheral series
HT86XX Voice series
Infineon
8-bit
XC800 family
16-bit
XE166 family
C166 family
C167 family
32-bit
TRICORE family
Intel
8-bit
MCS-48
MCS-51
8xC251
16-bit
MCS-96 (8096 family – also incl. 8061)
Intel MCS-296
Lattice Semiconductor
Mico8 8-bit
Mico32 32-bit
Microchip Technology
8-bit PICmicro
PIC10 and PIC12
PIC16 series
PICAXE
PIC18 series
PIC24
32-bit
PIC32MX series
National Semiconductor
COP400
COP8
CR16
SC/MP
NEC
17K
V25
75X
78K
V850
Parallax
SX
SX-18, 20, 28, 48 and 52 versions with speed up to 75 MHz (75 MIPS)
Propeller
NXP Semiconductors
8-bit
80C51
16-bit
XA
32-bit
ARM7
LPC2000
ARM9
LPC3000
ARM Cortex-M4
LPC4300
ARM Cortex-M3
LPC1700/LPC1300/LPC1800
ARM Cortex-M0
LPC1100/LPC1200
Rabbit Semiconductor
Rabbit 2000
Rabbit 3000
Rabbit 4000
Renesas Electronics
4-bit
720
8-bit
78K
SLP
740
16-bit
M16C
H8
R8C
32-bit
SuperH
V850
RX
SiLabs
C8051F300
C8051F120
Silicon Motion
SM2XX family
SM321
SM323
SM323E
SM324
SM330
SM501
SM712
SM722
SM340
SM350
SM370
Sony
SPC900 Series
SPC970 Series
SR11 Series
STMicroelectronics
ST6 (8-bit)
ST7 (8-bit)
STM8 (8-bit)
?PSD (8-bit)
ST10 (16-bit)
STM32 (ARM Cortex M3, 32-bit)
STR7 (ARM7TDMI, 32-bit)
STR9 (ARM966E-S, 32-bit)
Texas Instruments
TMS370 (8-bit)
MSP430 (16-bit)
TMS320F28xx (32-bit)
C2000 (32-bit, Real-time control)
Stellaris (32-bit, ARM Cortex-M3)
TMS570 (32-bit RISC, ARM Cortex-R4)
Toshiba
TLCS-47 (4-bit)
TLCS-870 (8-bit)
TLCS-900 (16 and 32-bit CISC)
TX19A (32-bit RISC)
Ubicom
IP2022
IP3022
Xemics
XE8000 8-bit
Xilinx
Microblaze 32-bit
Picoblaze 8-bit
XMOS
XCore XS1 32-bit
ZiLOG
Zilog Z8 – 8-bit
Zilog Z180
Zilog eZ8
Zilog eZ80
Zilog Z16