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SST89E54RDA
FlashFlex MCU

The SST89E54RDA is a member of the FlashFlex family of 8-bit microcontroller products designed and manufactured with SST patented and proprietary SuperFlash CMOS semiconductor process technology. The split-gate cell design and thick-oxide tunneling injector offer significant cost and reliability benefits for SST customers. The device is the 8051 instruction set and is pin-for-pin compatible with standard 8051 microcontroller devices.

The device comes with 24/40 KByte of on-chip flash EEPROM program memory which is partitioned into 2 independent program memory blocks. The primary Block 0 occupies 16/32 KByte of internal program memory space and the secondary Block 1 occupies 8 KByte of internal program memory space.

The 8-KByte secondary block can be mapped to the lowest location of the 16/32 KByte address space; it can also be hidden from the program counter and used as an independent EEPROM-like data memory.

In addition to the 24/40 KByte of EEPROM program memory on-chip and the 1024 x8 bits of onchip RAM, the device can address up to 64 KByte of external program memory and up to 64 KByte of external RAM. The flash memory blocks can be programmed via a standard 87C5x OTP EPROM programmer fitted with a special adapter and the firmware for SST devices. During power-on reset, the device can be configured as either a slave to an external host for source code storage or a master to an external host for an in-application programming (IAP) operation. The device is designed to be programmed in-system and in-application on the printed circuit board for maximum flexibility. The device is pre-programmed with an example of the bootstrap loader in the memory, demonstrating the initial user program code loading or subsequent user code updating via the IAP operation.

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