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 compatible 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
– Idle mode
– Power down mode
? Programmable clock out
? Second DPTR register
? Asynchronous port reset
? Low EMI (inhibit ALE)
? I
2C serial interface
? Programmable Counter Array (PCA)
– PWM
– Capture/compare
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