Microcontroller hardware development board are presented here.
Support for the single chip STC89C52 AT89S52 SCM pins or, in the form of needle inserted derivations, for simulation or external expansion when used. STC89C52 internal including 8 k bytes program memory and 512 bytes RAM, and 2 k bytes E2PROM chips was introduced; AT89S52 devices internal including 8 k bytes program memory and 256 bytes RAM.
Single chip external crystals for 11.0592 MHz, can take from the socket replacement for single-chip microcomputer allowed other frequency crystals. For STC89C52 allowed crystals highest frequency for 80 MHz, AT89S52 allowed for the highest frequency crystals for 33 MHz.
Reset circuit by reset button and RC charging and discharging of RC circuit circuit, by a 10 k resistance and capacitance constitute a 10 u.
Display resources including 6 a total of seven period of digital tube, Yang eight LED (green), eight LED (yellow) meet in the mouth for display on P3 microcontroller state, also include a LCD1602 display interface and a LCD12864 screen interface.
The keyboard resources including 4 * 4 buttons array, 4 independent key, including 4 independent key can be used as a single chip using the interruption of the source.
Interface resources including a serial port, the I2C bus interface, USB Deivce interface (can be used as power supply power use), program download interface, and AT89S52 SCM pins interface. Serial interface chip for MAX232, work in 5 V. One program download AT89S52 devices for 5 * 2 socket interface way, subject to special download AT89S52 transfer line PC parallel port.
Audio resources including a buzzer.
The whole board power by PC USB port provides 5 V / 500 mA dc power supply.
Storage resources including 1 piece of 24 C02 and 1 piece 93 C46, 24 C02 connection in the I2C bus, 256 bytes serial E2PROM chips was introduced on C02, 24 of the equipment or the address on the board three dial the code switch Settings. 93 C46 of serial E2PROM chips was introduced for SPI interface, 93 C46 storage space for 128 bytes.
TE45
