PRODUCT DESCRIPTION
SST89C54 and SST89C58 are members of the FlashFlex51 family of 8-bit microcontrollers. The FlashFlex51 family is a family of embedded microcontroller products designed and manufactured on the state-of-the-art SuperFlash CMOS semiconductor process technology.

FEATURES:
• Multi-Purpose 8-bit 8051 Family Compatible Microcontroller Unit (MCU) with Embedded SuperFlash Memory
• Fully Software and Development Toolset Compatible as well as Pin-For-Pin Package Compatible with Standard 8xC5x Microcontrollers
• 256 Bytes Register/Data RAM
• 20/36 KByte Embedded High Performance Flexible SuperFlash EEPROM
    – One 16/32 KByte block (128-Byte sector size)
    – One 4 KByte block (64-Byte sector size)
    – Individual Block Security Lock with Softlock™ feature
    – 87C5x Programmer Compatible
    – Concurrent Operation during In-Application Programming™(IAP™)
    – Memory Re-Mapping for Interrupt Support during IAP
• Support External Address Range up to 64 KByte of Program and Data Memory
• High Current Drive on Port 1 (5, 6, 7) pins
• Three 16-bit Timer/Counter
• Programmable Serial Port (UART)
• Six Interrupt Sources at 2 Priority Levels
• Selectable Watchdog Timer (WDT)
• Four 8-bit I/O Ports (32 I/O Pins)
• TTL- and CMOS-Compatible Logic Levels
• Extended Power-Saving Modes
    – Idle Mode
    – Power Down Mode with External Interrupt Wake-up
    – Standby (Stop Clock) Mode
• High Speed Operation at 5 Volts (0 to 33MHz)
• Low Voltage (2.7V) Operation (0 to 12MHz)
• PDIP-40, PLCC-44 and TQFP-44 Packages
• Temperature Ranges:
    – Commercial (0°C to +70°C)
    – Industrial (-40°C to +85°C)