STC89CXX Datasheet PDF - STCmicro Technology Co,.Ltd

Introduction
   STC89xx series, which is produced by STC MCU Limited, is a 8-bit single-chip microcontroller with a fully compatible instruction set with industrial-standard 80C51 series microcontroller. There is 64K bytes flash memory embeded for appliaction program, which is shared with In-System-Programming code.In-SystemProgramming (ISP) and In-Application-Programming (IAP) support the users to upgrade the program and data in system. ISP allows the user to download new code without removing the microcontroller from the actual end product;IAP means that the device can write non-valatile data in Flash memory while the application program is running. 

FEATUREs
• Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle
• Operation voltage range: 5.5V~3.3V (STC89C series) or 2.0V~ 3.6V (STC89LE series)
• Operation frequency range: 0- 48MHz@12T, or 0-24MHz@6T
• On-chip 4/8/13/16/20/32/64K FLASH program memory with flexible ISP/IAP capability
• On-chip 1280 byte / 512 byte RAM
• Be capable of addressing up to 64K byte of external RAM
• Be capable of addressing up to 64K bytes external memory
• Dual Data Pointer (DPTR) to speed up data movement
• Three 16-bit timer/counter, Timer 2 is an up/down counter with programmable clcok output on P1.0
• 8 vector-address, 4 level priority interrupt capability
• One enhanced UART with hardware address-recognition, frame-error detection function, and with self baudrate generator.
• One 15 bits Watch-Dog-Timer with 8-bit pre-scaler (one-time-enabled)
• integrate MAX810 — specialized reset circuit
• Three power management modes: idle mode and power-down mode
• Low EMI: inhibit ALE emission
• Power down mode can be woken-up by INT0/P3.2 pin, INT1/P3.3 pin, T0/P3.4, T1/P3.5, RXD/P3.0 pin, INT2/P4.3, INT3/P4.2
• Maximum 39 programmable I/O ports are available
• Four 8-bit bi-directonal ports; extra four-bit additional P4 are available for PLCC-44 and LQFP-44
• Operating temperature: -40 ~ +85oC (industrial) / 0~75oC (commercial)
• package type :PQFP-44,LQFP-44,PDIP-40,PLCC-44