Many special devices with I2C-Bus and big ones with extra I/O and A/D, D/A, PWM etc.
Also have virtual 16C550 UART interface.
Producers of the 8031 mcu.
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ATMEL | Flash, E2, low cost and custom devices. Up to 128K+4 K flash. with. "On board" programmable devices. |
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DALLAS | Enhanced speed, NV-RAM, NV-Clock, Dual Serial ports. (Nice ones!) |
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INTEL | 8031 and up, they invented it and still holds the lead in raw speed with the 16 bit MCS251. |
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OKI | Masked variants, 85C154 with piggyback EPROM. |
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PHILIPS | From 83C750 up to the XA 16 bit devices. Many special devices with I2C-Bus and big ones with extra I/O and A/D, D/A, PWM etc. |
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SIEMENS | A/D, D/A extra I/O:s and more. |
| SMC | COM20051 with high speed ARCNET support. | |
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TEMIC | CAN/VAN Interface, Low voltage versions, ROM-Security functions. |
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ISSI | Fast 80C31/51 up to 40 MHz. |
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TDK | Special modem versions up to 44 MHz, Hardware CRC calculation,
Bankswitching support and some other features. Also have virtual 16C550 UART interface. |
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LG | (Formerly GoldStar) "GMS90" series mcu, 80C51 compatible and OTP versions of Atmel 89Cx051. |
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WINBOND | FLASH up to 32K. AD / DA / PWM / I2C devices and extra I/O. |
| Daewoo | Possibly makes MASK-ROM 8051:s. Have not found any pages on these chips. | |
Interested: