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8051 MCU for the target, under the same operating frequency, the STC8H series MCU is about 12 times faster than the traditional 8051 (faster 11.2~13.2 times), execute all 111 instructions in sequence, the STC8H series microcontroller only needs 147 clocks, while the traditional 8051 1944 clocks are required. STC8H series microcontrollers are single clock/machine cycle (1T) microcontrollers produced by STC. A new generation of 8051 microcontroller with high reliability/low power consumption/strong anti-static/strong anti-interference, super encryption. The instruction code is fully compatible with legacy 8051. MCU integrates high-precision R/C clock (±0.3%, +25℃ at room temperature), -1.38%～+1.42% temperature drift (-40℃~+85℃), -0.88%～+1.05% temperature drift ( -20℃~+65℃). The wide range of 4MHz~35MHz can be set during ISP programming (note: when the temperature range is -40℃~+85℃, the maximum frequency must be controlled below 35MHz), which can completely save the external expensive crystal oscillator and external reset circuit (internally integrated High reliability reset circuit, 4-level reset threshold voltage optional during ISP programming). There are 3 optional clock sources inside the MCU: internal high-precision IRC clock (which can be adjusted up or down appropriately), internal 32KHz low-speed IRC, external 4M~33M crystal oscillator or external clock signal. The clock source can be freely selected in the user code. After the clock source is selected, the clock signal can be divided by an 8-bit frequency divider and then provided to the CPU and various peripherals (such as timer, serial port, SPI, etc.). The MCU provides two low-power modes: IDLE mode and STOP mode. In IDLE mode, the MCU stops providing clocks to the CPU, The CPU has no clock, and the CPU stops executing instructions, but all peripherals are still working, and the power consumption is about 1.3mA (6MHz operating frequency). The STOP mode is the main clock stop mode, that is, the traditional power-down mode/power-down mode/stop mode. At this time, the CPU and all external All devices stop working, and the power consumption can be reduced to 0.6uA@Vcc=5.0V, 0.4uA@Vcc=3.3V. Power-down mode can use INT0(P3.2), INT1(P3.3), INT2(P3.6), INT3(P3.7), INT4(P3.0), T0(P3.4), T1(P3) .5), T2(P1.2), T3(P0.4), T4(P0.6), RXD(P3.0/P3.6/P1.6/P4.3), RXD2(P1.4/ P4.6), RXD3(P0.0/P5.0), RXD4(P0.2/P5.2), I2C_SDA(P1.4/P2.4/P3.3) and comparator interrupt, low voltage detection interrupt, The power-down wake-up timer continues to wake up. MCU provides a wealth of digital peripherals (serial port, timer, advanced PWM and I2C, SPI, USB) interface and analog peripherals (ultra-high-speed ADC, comparator), which can meet the design needs of the majority of users. The STC8H series microcontroller integrates an enhanced double data pointer. Through program control, the automatic increment or decrement function of the data pointer and the automatic switching function of the two groups of data pointers can be realized. |
