W78E58B-40

W78E58B-40 - 8-BIT MICROCONTROLLER 

1. GENERAL DESCRIPTION 

The W78E58B is an 8-bit microcontroller which has an in-system programmable Flash EPROM for 

firmware updating. The instruction set of the W78E58B is fully compatible with the standard 8052. The 

W78E58B 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 a eight 

sources two-level interrupt capability. To facilitate programming and verification, the ROM inside the 

W78E58B allows the program memory to be programmed and read electronically. Once the code is 

confirmed, the user can protect the code for security. 

The W78E58B 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. 

2. 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 

· Packaged in 

 - DIP 40: W78E58B-24/40 

 - PLCC 44: W78E58BP-24/40 

 - QFP 44: W78E58BF-24/40 

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