W79E217A Datasheet, PDF (5/207 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E217A Data Sheet
1. GENERAL DESCRIPTION
The W79E217 is a fast, 8051/52-compatible microcontroller with a redesigned processor core that
eliminates wasted clock and memory cycles. Typically, the W79E217 executes instructions 1.5 to 3
times faster than that of the traditional 8051/52, depending on the type of instruction, and the overall
performance is about 2.5 times better at the same crystal speed. As a result, with the fully-static
CMOS design, the W79E217 can accomplish the same throughput with a lower clock speed, reducing
power consumption.
The W79E217 provides 256 bytes of on-chip RAM; 2-KB of NVM memory Flash EPROM; 2-KB of
auxiliary RAM; seven 8-bit, bi-directional and bit-addressable I/O ports; an additional 4-bit port P4;
three 16-bit timer/counters; Motion Feedback Module support; 2 UART serial ports; 1 channels of I2C
with master/slave capability; 1 channels of Serial Peripheral Interface (SPI), 8 channels of 12 bit PWM
with configurable dead time and 8 channels of 10-bit ADC. These peripherals are all supported by 20
interrupt sources with 4 levels of priority.
The W79E217 also contains a 64-KB Flash EPROM whose contents may be updated in-system by a
loader program stored in an auxiliary, 4-KB Flash EPROM. Once the contents are confirmed, it can be
protected for security.
Publication Release Date: December 14, 2007
-5-
Revision A3.0