89C668 Datasheet | NXP Semiconductors

DESCRIPTION The P89C668 device contains a non-volatile 64 kbytes Flash program memory that is both parallel programmable and serial In-System Programmable. In-System Programming allows devices to alter their own program memory, in the actual end product, under software control. This opens up a range of applications that can include the ability to field update the application firmware. A default serial loader (boot loader) program in ROM allows serial In-System programming of the Flash memory without the need for a loader in the Flash code. User programs may erase and reprogram the Flash memory at will through the use of standard routines contained in ROM. This device is a Single-Chip 8-Bit Microcontroller manufactured in advanced CMOS process and is a derivative of the 80C51 microcontroller family. The device has the same instruction set as the 80C51. The device also has four 8-bit I/O ports, three 16-bit timer/event counters, a multi-source, four-priority-level, nested interrupt structure, an enhanced UART and on-chip oscillator and timing circuits. The added Features of the P89C668 makes it a powerful microcontroller for applications that require pulse width modulation, high-speed I/O and up/down counting capabilities such as motor control. Features - 80C51 Central Processing Unit - On-chip Flash Program Memory with In-System Programming (ISP) capability - Boot ROM contains low level Flash programming routines for downloading via the UART - Can be programmed by the end-user application (IAP) - Parallel programmed with 87C51 patible hardware interface to programmer - Speed up to 20 MHz with 6 clock cycles per machine cycle (40 MHz equivalent performance); up to 33 MHz with 12 clocks - Full static operation - RAM expandable externally to 64 kbytes - 4 level priority interrupt - 8 interrupt sources - Four 8-bit I/O ports - Full-duplex enhanced UART - Framing error detection - Automatic address recognition - Power control modes - Clock can be stopped and resumed -...