W79E225A Datasheet, PDF (5/200 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E225A/227A Data Sheet
1. GENERAL DESCRIPTION
The W79E225/227 is a fast, 8051/52-compatible microcontroller with a redesigned processor core that
eliminates wasted clock and memory cycles. Typically, the W79E225/227 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 W79E225/227 can accomplish the same throughput with a lower clock speed,
reducing power consumption.
The W79E225/227 provides 256 bytes of on-chip RAM; 1/2-KB of NVM memory Flash EPROM; 1/2-
KB of auxiliary RAM; four 8-bit, bi-directional and bit-addressable I/O ports; an additional 4-bit port P4
and 2-bit port P5; 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 W79E225/227 also contains a 16/64-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 A2.0