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GENERAL DESCRIPTION
The W78E65 is an 8-bit microcontroller which has an in-system programmable Flash EPROM for firmware updating. The instruction set of the W78E65 is fully compatible with the standard 8052.The W78E65 contains a 64K bytes of main ROM anda 4K bytes of auxiliary ROM which allows the contents of the 64KB main ROM to be updatedby the loader program located at the 4KB auxiliary ROM;256+1K bytes of on-chip RAM;four 8-bitbi-directional and bit-addressable VO 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 W78E65 allows the program memory to be proagrammed and read electronically. Once the code is confirmed, the user can protect the code for security.
The W78E65 microcontroller has two power reduction modes, idle mode and power-down mode, both of which are software selectable. The idle mode tums off the processor clock but allows for continued peripheral operation. The power-down modestops 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
· Fully static design 8-bit CMOS microcontroller
· 64K bytes of in-system programmable Flash EPROM for Application Program (AP FLASH
EPROM)
4K bytes of auxiliary ROM for Loader Program (LD FLASH EPROM)
256+1K bytes of on-chip RAM.(Including1K bytes of AUX-RAM, software selectable)64K bytes program memory address spaceand 64K bytes data memory address space ALE off software selectable.
Four 8-bit bi-directional ports;Port 0 has internal pull-up resisters enabled by software One 4-bit multipurpose programmableport (l/O, interrupt, Chip select function)Three 16-bit timer/counters One full duplex serial port 5 channel PWM Watchdog timer Software Reset
P1.0 T2 programmable clock out Eight-sources, two-level interrupt capability Built-in power management Code protection Packaged in -DIP 44: W78E65-40 -PLCC44: W78E65P-40 -QFP44: W78E65F-40
-Lead Free(RoHS)PLCC 44:W78E065A40PL -Lead Free(RoHS)DIP 40: W78E065A40DL -Lead Free(RoHS)QFP44: W78E065A40FL
Publication Release Date:January 9,2006
-3-
Revision A7
