51 MCU Minimum System Board STC12C5A60S2 STC89C52 Learning DevelopmentBoard MCUUART with 2 Serial Port

Manual: Click here to openFeatures:1. Enhancement type 8051 CPU,1T,single clock/machine cycle;instruction code is completely compatible with traditional 80512. On-chip integrates 1280 bytes RAM3. Common I/0 ports,after reset:quasi two-way ports/weak pull-up (common 8051 traditional I/O port);can be set four modes as:quasi two-way port/weak pull-up;strong push-pull/strong pull-up;only input/high resistance;open-drain.Every I/O ports driving capacity can be up to 20mA,but the whole chip should be no more than 120mA4. ISP (programmable in system)/IAP (programmable in appplication),does not need special emulator;and it can download user applications directly by serial port (P3.0/P3.1) after a few seconds5. EEPROM function and Watch dog6. Internal integrates MAX810 special reset circuit (when external crystal is less than 12M,reset pin can directly connect with 1K resistor to ground)7. A/D switch,10-bit precise ADC,totally 8-channel;switch speed can be up to 250K/sSpecifications:- Operating Voltage: 3.5-5.5V- Operating Frequency: 0-35MHz,equals to common 8051 0-420MHz- External power failure detection circuit:there is a low voltage threshold comparator in P4.6 port.5V MCU is 3.3V,and the tolerance is +/-5%- Clock source: external high precision crystal/clock,internal R/C oscillator (temperature drift is +/-5%~+/-10%).When users download applications,they can choose whether to use internal R/C oscillator or external crystal/clock.At normal temperature,internal R/C oscillator freque