The W78L33 microcontroller supplies a wider frequency range and supply voltages than most 8-bit microcontrollers on the market. It is functional compatible with the industry standard 80C32 microcontroller series except the one extra 4-bit addressable I/O port. Besides, it is available in 44-pin QFP package.

Here are some features about it: (1)fully static design 8-bit CMOS microcontroller; (2)supply voltage of 1.8 V to 5.5 V; (3)DC-24 MHz operation; (4)256 bytes of on-chip scratchpad RAM; (5)ROMless operation; (6)one full duplex serial port; (7)built-in power management.

What comes next is about its absolute maximum ratings: (1)DC power supply: -0.3 V to 7.0 V; (2)input voltage: VSS-0.3 V to VCC+0.3 V; (3)operating temperature: 0 ℃ to 70 ℃; (4)storage temperature: -55 ℃ to 150 ℃. Then is about DC characteristics(Ta=25 ℃, Fosc=20 MHZ): (1)operating voltage: 1.8 V to 5.5 V; (2)operating current: 20 mA max; (3)idle current(VDD=5.5 V, Fosc=20 MHz): 6 mA max; (4)power down current(VDD=2.0 V, Fosc=16 MHz): 20 μA max.