CH551G development board features the CH551 chip, which is an enhanced e8051 core single-chip microcomputer compatible with MCS51 instruction set. 79% of its instructions are single-byte single-cycle instructions, and the average instruction speed is 8-15 times faster than the standard MCS51.

Features

• →Complete development board in a pocket-size with SOP16 package
• →Rich I/O interfaces for project expandability
• →4 channel capacitive touch buttons for touch applications
• →Support USB 2.0 full speed 12mbps or low speed 1.5mbps with direct download
• →Compatible with breadboard via the header with 2.54mm pin spacing

Description

CH551G development board features the CH551 chip, which is an enhanced e8051 core single-chip microcomputer compatible with MCS51 instruction set. 79% of its instructions are single-byte single-cycle instructions, and the average instruction speed is 8-15 times faster than the standard MCS51.

CH551 supports up to 24MHz system main frequency. It has built-in 10KB program memory (ROM), 256-byte internal IRAM, and 512 bytes on-chip xram. Xram supports DMA (direct memory access).

The ch551 has 4 channel capacitive touch buttons, three sets of timers and signal capture, PWM, SPI, asynchronous serial port (UART0), USB device controller, and full speed transceiver.

Specifications

• →Core: enhanced e8051 core, compatible with MCS51 instruction set. 79% of its instructions are single byte single cycle instructions. The average instruction speed is 8-15 times faster than the standard MCS51. It has a special xram data replication instruction and double dptr pointer.
• →ROM: 10 KB capacity of multi programmable non-volatile memory ROM, can be used for all program storage space
• →Data Flash: 128 bytes multi erasable non-volatile data memory, which supports rewriting data in bytes.
• →RAM: 256 bytes internal RAM, which can be used for fast data storage and stack; 512 bytes on chip xram can be used for large amount of data temporary storage and DMA (direct memory access).
• →USB: embedded USB controller and USB transceiver, supporting USB device mode, master-slave detection, supporting USB 2.0 full speed 12mbps or low-speed 1.5mbps. FIFO is built-in and supports 64 bytes of data packets.
• →Timer: three groups of timers, t0 / T1 / T2 is the standard MCS51 timer.
• →Capture: timer T2 is extended to support 2-way signal capture.
• →PWM: 2 sets of PWM output, pwm1 / pwm2 is 2-way 8-bit PWM output.
• →UART: asynchronous serial port, support higher communication baud rate, UART0 is the standard MCS51 serial port.
• →SPI: SPI controller has built-in FIFO, clock frequency up to half of the system's main frequency Fsys, supports serial data input and output simplex multiplexing, and supports master / slave mode.
• →Touch key: 4-channel capacitance detection, support independent timing interrupt.
• →GPIO: supports up to 17 GPIO pins (including Xi / XO, RST and USB signal pins).
• →Interrupt: supports 14 groups of interrupt signal sources, including 6 groups of interrupts (INT0, T0, INT1, T1, etc.) compatible with standard MCS51 UART0, T2), and extended 8 groups of interrupts (spi0, tkey, USB, ADC, uart1, pwmx, GPIO, wdog), in which GPIO interrupt can be selected from 7 pins.
• →Watch dog: 8 bits can preset watchdog timer wdog, support timing interrupt.
• →Reset: support 4 kinds of reset signal source, built-in power on reset, support software reset and watchdog overflow reset, optional pin external input reset.
• →Clock: built in 24 MHz clock source, which can support external crystal by multiplexing GPIO pins.
• →Power: built in 5V to 3.3V low voltage differential voltage regulator, supporting 5V or 3.3V or even 2.8V power supply voltage. It supports low-power sleep, USB, UART0, uart1, spi0 and part of GPIO external wake-up.
• →The chip has a unique ID number.

How to Flash Bootloader?

• →Open WCHISPTool_Setup file 
• →Press and hold  the BL button on the development board and connect the USB cable to the PC 
• →Select "8-bit CH55x series from the top menu
• →Select CH551 as the chip mode
• →Check the boxes: "Run the target program after download complete", "Clear DataFlash"
• →Select the file you want to download under "User File"
• →Click the "Download" button

Hardware Overview

Part List 

• 1 x CH551G Development board 

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