W78C438B

The W78C438B is a kind of high-performance single-chip CMOS 8-bit microcontroller which is a derivative of the W78C58 microcontroller family. It is functionally compatible with the W78C32, except that it provides either a 64 KB program/1 MB data memory address or memory-mapped selecy logic, five general I/O ports, and four external interrupts.

There are some W78C438B features as follows: (1)8-bit CMOS microcontroller; (2)fully static design; (3)DC to 40 MHz operation; (4)ROM-less operation; (5)256-byte on-chip scratchpad RAM; (6)either 64 KB program/1 MB data memory address space or 4 memory-mapped chip select pins; (7)one 8-bit data/address port; (8)two 8-bit and one 4-bit (optional) address ports ; (9)five 8-bit addressable I/O ports and one 8-bit parallel I/O port; (10)eight-source, two-level interrupt capability; (11)three 16-bit timer/counters; (12)four external interrupts; (13)one full-duplex serial channel; (14)built-in power management: idle mode and power-down mode.

The following is about the W78C438B absolute maximum ratings: (1)DC power supply, VDD-VSS: -0.3 to +7.0 V; (2)input voltage, VIN: VSS-0.3 to VDD+0.3 V; (3)operating temperature, TOPR: 0 to 70; (4)storage temperature, TSTG: -55 to +150.