[STC MCU Limited.]

Introduction
STC12C5A60S2 is a single-chip microcontroller based on a high performance 1T architecture 80C51 CPU, which is produced by STC MCU Limited. With the enhanced kernel, STC12C5A60S2 executes instructions in 1~6 clock cycles (about 6~7 times the rate of a standard 8051 device), and has a fully compatible instruction set with industrial-standard 80C51 series microcontroller. In-System-Programming (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. The STC12C5A60S2 retains all features of the standard 80C51. In addition, the STC12C5A60S2 has two extra I/O ports (P4 and P5), a 10-sources, 4-priority-level interrupt structure, 10-bit ADC, two UARTs, on-chip crystal oscillator, a 2-channel PCA and PWM, SPI, a one-time enabled Watchdog Timer.

Features
• Enhanced 80C51 Central Processing Unit ,1T per machine cycle,
   faster 6~7 times than the rate of a standard 8051.
• Operating voltage range: 5.5V ~ 3.5V or 2.2V ~ 3.6V (STC12LE5A60S2).
• Operating frequency range: 0- 35MHz, is equivalent to standard 8051:0~420MHz
• On-chip 8/16/20/32/40/48/52/56/60/62K FLASH
   program memory with flexible ISP/IAP capability
• On-chip 1280 byte RAM: 256 byte scratch-pad RAM and 1024 bytes of auxiliary RAM
• Be capable of addressing up to 64K byte of external RAM
• Dual Data Pointer (DPTR) to speed up data movement
• Code protection for flash memory access
• Excellent noise immunity, very low power consumption
• four 16-bit timer/counter, be compatible with Timer0/Timer1 of standard 8051,
   2-channel PCA can be available as two timers.
• 10 vector-address, 4 level priority interrupt capability
• One enhanced UART with hardware address-recognition
   and frame-error detection function
• Secondary UART with self baud-rate generator
• One 15 bits Watch-Dog-Timer with 8-bit pre-scaler (one-time-enabled)
• SPI Master/Slave communication interface
• Two channel Programmable Counter Array (PCA)
• 10-bit, 8-channel Analog-to-Digital Converter (ADC)
• Simple internal RC oscillator and external crystal clock
• Power control: idle mode(all interrupt can wake up IDLE mode),
   power-down mode(external interrupt can
• wake up Power-Down mode) and slow down mode
• Power down mode can be woken-up by PCA_pin, RXD_pin,
   T0/T1 pin and external interrupts (INT0, INT1)
• 44/40/36 programmable I/O ports are available
• Programmable clock output Function. T0 output the clock
   on P3.4,T1 output the clock on P3.5,BRT output the clock on P1.0
• External low-voltage detector function
   (P4.6, the EA pin at the pin location of standard 8051)
• Five package type : LQFP-44, LQFP-48 ,PDIP-40, PLCC-44,QFN-40