STC micro STC8A8K64D4 Series - Digital Leds Driven Directly by I;O Port Circuit; LCD Segment LCD Driven Directly by I;O Port Circuit

STC8A8K64D4 Series Manual
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9.10 Digital LEDs Driven Directly by I/O Port Circuit
9.11 LCD Segment LCD Driven Directly by I/O Port Circuit
An external LCD driver IC is needed when you design a product having segment LCD display requirement using MCU
without LCD driver is used, which will increase cost. In fact, many small projects, such as a large number of small appliances,
do not need to display a lot of segment codes. There are usually four 8 colons with a decimal point or clock: ":", so if you use
the IO port to scan and display directly, it will reduce costs and work more reliably.
However, this solution is not suitable for driving too many segments (occupying too many IOs), and it is not suitable for
very low power consumption occasions (driving will have hundreds of uA current).