Description The W78E058B is an 8-bit microcontroller which has an in-system programmable Flash EPROM for firmware updating. The instruction set of the W78E058B is fully compatible with the standard 8052. The W78E058B contains a 32K bytes of main ROM and a 4K bytes of auxiliary ROM which allows the contents of the 32KB main ROM to be updated by the loader program located at the 4KB auxiliary ROM; 512 bytes of on-chip RAM; four 8-bit bi-directional and bit-addressable I/O ports; an additional 4-bit port P4; three 16-bit timer/counters; a serial port. These peripherals are supported by an eight sources two-level interrupt capability. Features Fully static design 8-bit CMOS microcontroller 32K bytes of in-system programmable Flash EPROM for Application Program (APROM) 4K bytes of auxiliary ROM for Loader Program (LDROM) 512 bytes of on-chip RAM (including 256 bytes of AUX-RAM、software selectable) 64K bytes program memory address space and 64K bytes data memory address space Four 8-bit bi-directional ports One 4-bit multipurpose programmable port Three 16-bit timer/counters One full duplex serial port Eight-sources、two-level interrupt capability Built-in power management Code protection
