W79E225A_08 Datasheet, PDF (5/203 Pages) Winbond – 8-bit Microcontroller

Preliminary W79E225A/226A/227A Data Sheet
1. GENERAL DESCRIPTION
The W79E22X SERIES is a fast, 8051/52-compatible microcontroller with a redesigned processor
core that eliminates wasted clock and memory cycles. Typically, the W79E22X SERIES 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 W79E22X SERIES can accomplish the same throughput
with a lower clock speed, reducing power consumption.
The W79E22X SERIES provides 256 bytes of on-chip RAM; 1/2/2-KB of NVM Data Flash EPROM;
1/2/2-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 W79E22X SERIES also contains a 16/32/64-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: April 15, 2008
-5-
Revision A4.0