w78e516b Winbond Electronics Corp America, w78e516b Datasheet - Page 3

• Manufacturer Part Number: w78e516b
• Description: 8-bit Microcontroller
• Manufacturer: Winbond Electronics Corp America

1. GENERAL DESCRIPTION
The W78E516B is an 8-bit microcontroller which has an in-system programmable Flash EPROM for
firmware updating. The instruction set of the W78E516B is fully compatible with the standard 8052.
The W78E516B contains a 64K bytes of main Flash EPROM and a 4K bytes of auxiliary Flash
EPROM which allows the contents of the 64KB main Flash EPROM to be updated by the loader
program located at the 4KB auxiliary Flash EPROM 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 Flash EPROM inside the W78E516B allows the program
memory to be programmed and read electronically. Once the code is confirmed, the user can protect
the code for security.
The W78E516B 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
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Fully static design 8-bit CMOS microcontroller up to 40 MHz.
64K bytes of in-system programmable Flash EPROM for Application Program (APROM).
4K bytes of auxiliary Flash EPROM 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
Six-sources, two-level interrupt capability
Built-in power management
Code protection
Packaged in
− Lead Free (ROHS) DIP 40:
− Lead Free (ROHS) PLCC 44: W78E516B40PL
− Lead Free (ROHS) PQFP 44: W78E516B40FL
W78E516B40DL
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Publication Release Date: April 22, 2008
W78E516B
Revision A12