It enables high speed communi-cation between the microcontroller and other peripherals or other microcontrollers by using few input/output lines (maximum two or three). The main read only memory devices are listed below: ROM (Mask Programmable ROM—also called “MROMs”) EPROM (UV Erasable Programmable ROM) OTP (One Time Programmable EPROM) EEPROM (Electrically Erasable and Programmable ROM) Flash Memory - This device is covered in Section 10. Consequently, a PROM can only be programmed once. HOW THE DEVICE WORKS The read only memory cell usually The use of one-time programmable memory (OTP) memory, including PROM and ROM, will typically achieve these objectives. The software is printed on a complementary metal–oxide semiconductor (CMOS) 4 chip, using standard manufacturing processes. So it is called one- time programming device. MSSP module (Master Synchronous Serial Port) is a very useful, but at the same time one of the most complex circuits within the microcontroller. Fig. The first memory cell includes a floating gate, a select gate, a first doped region, a second doped region and a third doped region. The LC86P6548 is a CMOS 8-bit single chip microcontroller with one-time PROM for the LC866500 series. In the case of PROMs, instead of being done at the manufacturer ‘ s premises during the manufacturing process, the programming is done by the customer with the help of a special gadget called a PROM programmer. Features (1) Option switching by PROM data The option function of the LC866500 series can be specified by the PROM data. The floating gate is disposed on the sidewall of the trench. The Flash Patch function allows using a small programmable memory in the system to apply patches to a program memory which cannot be modified. For products to be produced in high volume, using mask ROM or one-time-programmable ROM can reduce the cost of the product. Programming ROM also called burning ROM, requires special equipment called a ROM burner or ROM … Programmable read-only memory (PROM), or one-time programmable ROM (OTP), can be written to or programmed via a special device called a PROM programmer. It offers a factory-programmable PLL output that can be set to almost any frequency, ranging from 4MHz to 200MHz. A one time programmable memory including a first memory cell is provided. Therefore, it is commonly used to An antifuse-based bit cell uses controlled, irreversible thin (gate) oxide breakdown to program a bit. This microcontroller has the function and the pin description of the LC866500 series mask ROM version, and 48K-byte PROM. Since the data, once programmed, cannot be erased and reprogrammed, these devices are also referred to as one-time programmable ROMs. Programmable Read Only Memory (PROM) and One-Time-Programmable (OTP) Memory can be written to once. Description While the memory contents for a ROM are set at design/manufacturing time, Programmable Read Only memories (PROM) and more recently One-Time Programmable (OTP) devices can be programmed after manufacturing making them a lot more flexible. Typically, this device uses high voltages to permanently destroy or create internal links (fuses or antifuses) within the chip. Programmable ROM . The MAX9491 uses a one-time-programmable (OTP) ROM to p For this reason, PROM is also referred to as OTP (One Time Programmable). The first memory cell is disposed on a substrate having a trench disposed therein. Read Only Memory (ROM) is an integrated circuit which is pre-programmed with specific functional data at manufacturing time. The MAX9491 multipurpose clock generator is ideal for communication applications. Antifuse one-time programmable (OTP) provides a flexible, field-programmable alternative to ROM. 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