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Microcontroller devices with integrated I/O and memory on-chip sometimes had no, or a small, address bus available for external devices. For example, a microcontroller family available with a 2 kilobyte address space might have a variant that brought out an 11 line address bus for an external ROM; this could be done by reassigning I/O pins as address bus pins.
The Atmel 8-bit AVR RISC-based microcontroller combines 32 KB ISP flash memory with read-while-write capabilities, 1 KB EEPROM, 2 KB SRAM, 23 general-purpose I/O lines, 32 general-purpose working registers, 3 flexible timer/counters with compare modes, internal and external interrupts, serial programmable USART, a byte-oriented 2-wire serial ...
The COP400 or COP II is a 4-bit microcontroller family introduced in 1977 by National Semiconductor as a follow-on product to their original PMOS COP microcontroller. [1] COP400 family members are complete microcomputers containing internal timing, logic, ROM, RAM, and I/O necessary to implement dedicated controllers. [ 2 ]
MCS-51-based microcontrollers typically include one or two UARTs, two or three timers, 128 or 256 bytes of internal data RAM (16 bytes of which are bit-addressable), up to 128 bytes of I/O, 512 bytes to 64 KB of internal program memory, and sometimes a quantity of extended data RAM (ERAM) located in the external data space. External RAM and ROM ...
the RAM in microcontrollers (usually from around 32 bytes to a megabyte), the on-chip caches in more powerful CPUs, such as the x86 family, and many others (from 8 KB , up to many megabytes), the registers and parts of the state-machines used in some microprocessors (see register file ),
TMS 1000 (the first high-volume commercial microcontroller, from 1974, after Intel 4004; now discontinued) Atmel MARC4 core [27] [28] (discontinued because of Low demand. "Last ship date: 7 March 2015" [29]) Samsung S3C7 (KS57 Series) 4-bit microcontrollers (RAM: 512 to 5264 nibbles, 6 MHz clock) Toshiba TLCS-47 series; HP Saturn; NEC μPD75X ...
PIC microcontrollers in DIP and QFN packages 16-bit 28-pin PDIP PIC24 microcontroller next to ... To limit the number of pins ... If banked RAM is used, the high 16 ...
The die from an Intel 8742, an 8-bit microcontroller that includes a CPU running at 12 MHz, 128 bytes of RAM, 2048 bytes of EPROM, and I/O in the same chip Two ATmega microcontrollers. A microcontroller (MC, UC, or μC) or microcontroller unit (MCU) is a small computer on a single integrated circuit.