W78C31B

www.DataSheet4U.com W78C31B 8-BIT MICROCONTROLLER GENERAL DESCRIPTION The W78C31B microcontroller supplies a wider frequency range than most 8-bit microcontrollers on the market. It is compatible with the industry standard 80C31 microcontroller series. The W78C31B contains four 8-bit bidirectional parallel ports, two 16-bit timer/counters, and a serial port. These peripherals are supported by a five-source, two-level interrupt capability. There are 128 bytes of RAM, and the device supports ROMless operation for application programs. The W78C31B microcontroller has two power reduction modes, idle mode and power-down mode, both of which are software selectable. The idle mode turns off the processor clock but allows for continued peripheral operation. The power-down mode stops the crystal oscillator for minimum power consumption. The external clock can be stopped at any time and in any state without affecting the processor. FEATURES 8-bit CMOS microcontroller Fully static design Low standby current at full supply voltage DC-40 MHz operation 128 bytes of on-chip scratchpad RAM ROMless operation 64K bytes program memory address space 64K bytes data memory address space Four 8-bit bidirectional ports Two 16-bit timer/counters One full duplex serial port Boolean processor Five-source, two-level interrupt capability Built-in power management Packages: − DIP 40: W78C31B-16/24/40 − PLCC 44: W78C31BP-16/24/40 − QFP 44: W78C31BF-16/24/40 − TQFP 44: W78C31...