W78E365A pdf datasheet W78E365A is a low-power 8-bit microcontroller with Flash EPROM with ISP function; the Flash EPROM with ISP function can be used for firmware upgrade. Its instruction set is fully compatible with the standard 8052 instruction set. W78E365 contains 64K bytes of main ROM and 4K bytes of auxiliary Flash EPROM. (The loader program located in the 4K bytes of auxiliary ROM allows the user to update the program content located in the 64K main ROM.) 256 bytes of on-chip RAM, 1K byte of auxiliary RAM; 4 8-bit bidirectional, bit-addressable I/O ports; an additional 4-bit I/O port P4; 3 16-bit timers/counters and a serial port. These peripherals are supported by an interrupt system with 9 interrupt sources and 4-level interrupt capabilities. In order to facilitate user programming and verification, the ROM contained in W78E365 allows electrical programming.
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