Product Description
The SST89E54RD2A/RDA and SST89E58RD2A/RDA are members 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 devices use the 8051 instruction set and are pin-for-pin compatible with standard 8051 microcontroller devices.

FEATUREs
• 8-bit 8051-Compatible Microcontroller (MCU) with Embedded SuperFlash Memory
   – Fully Software Compatible
   – Development Toolset Compatible
   – Pin-For-Pin Package Compatible
• SST89E5xRD2A Operation
   – 0 to 40 MHz at 5V
• 1 KByte Internal RAM
• Dual Block SuperFlash EEPROM
   – 16/32 KByte primary block + 8 KByte secondary block (128-Byte sector size for both blocks)
   – Individual Block Security Lock with SoftLock
   – Concurrent Operation during In-Application Programming (IAP)
   – Memory Overlay for Interrupt Support during IAP
• Support External Address Range up to 64 KByte of Program and Data Memory
• Three High-Current Drive Ports (16 mA each)
• Three 16-bit Timers/Counters
• Full-Duplex, Enhanced UART
   – Framing Error Detection
   – Automatic Address Recognition
• Ten Interrupt Sources at 4 Priority Levels
   – Four External Interrupt Inputs
• Programmable Watchdog Timer (WDT)
• Programmable Counter Array (PCA)
• Four 8-bit I/O Ports (32 I/O Pins) and One 4-bit Port
• Second DPTR register
• Low EMI Mode (Inhibit ALE)
• SPI Serial Interface
• Standard 12 Clocks per cycle, the device has an option to double the speed to 6 clocks per cycle.
• TTL- and CMOS-Compatible Logic Levels
• Brown-out Detection
• Low Power Modes
   – Power-down Mode with External Interrupt Wake-up
   – Idle Mode
• Temperature Ranges:
   – Commercial (0°C to +70°C)
• Packages Available
   – 44-lead PLCC
   – 40-pin PDIP (Port 4 feature not available)
   – 44-lead TQFP
• All non-Pb (lead-free) devices are RoHS compliant