P89V664单片机解密

0 次 时间：2009-08-27 / 11:00:30 来源：夏生

P89V664 description
The P89V664  are 80C51 microcontrollers with 64 kB flash and
2 kB of data RAM. These devices are designed to be drop-in and software
compatible replacements for the P89V664 devices. Both the In-System
Programming (ISP) and In-Application Programming (IAP) boot codes are upward
compatible.
Additional features of the P89V664 devices when compared to the
P89V664 devices are the inclusion of a secondary 100 kHz byte-wide I2C-bus
interface, an SPI interface, four addition I/O pins (Port 4), and the ability to erase code
memory in 128-byte pages.
The IAP capability combined with the 128-byte page size allows for efficient use of the
code memory for non-volatile data storage.
Features：
· 128-byte page erase for efficient use of code memory as non-volatile data storage
· 0 MHz to 40 MHz operating frequency in 12x mode, 20 MHz in 6x mode
· 64 kB of on-chip flash user code memory with ISP and IAP
· 2 kB RAM
· SPI (Serial Peripheral Interface) and enhanced UART
· PCA (Programmable Counter Array) with PWM and Capture/Compare functions
· Three 16-bit timers/counters
· Four 8-bit I/O ports, one 4-bit I/O port
· WatchDog Timer (WDT)