P89C51RD2HBA

The P89C51RD2HBA device contains a non-volatile 16kB/32kB/64kB Flash program memory that is both parallel programmable and serial In-System and In-Application Programmable. In-System Programming (ISP) allows the user to download new code while the microcontroller sits in the application.In-Application Programming (IAP) means that the microcontroller fetches new program code and reprograms itself while in the system. This allows for remote programming over a modem link.A default serial loader (boot loader) program in ROM allows serial In-System programming of the Flash memory via the UART without the need for a loader in the Flash code. For In-Application Programming, the user program erases and reprograms the Flash memory by use of standard routines contained in ROM.

The feature of the P89C51RD2HBA are:(1)80C51 Central Processing Unit; (2)On-chip Flash Program Memory with In-System Programming(ISP) and In-Application Programming (IAP) capability; (3)Boot ROM contains low level Flash programming routines for downloading via the UART; (4)Can be programmed by the end-user application (IAP); (5)6 clocks per machine cycle operation (standard); (6)12 clocks per machine cycle operation (optional); (7)Speed up to 20 MHz with 6 clock cycles per machine cycle (40 MHz equivalent performance); up to 33 MHz with 12 clocks per machine cycle; (8)Fully static operation; (9)RAM expandable externally to 64 kB; (10)4 level priority interrupt; (11)8 interrupt sources; (12)Four 8-bit I/O ports; (13)Full-duplex enhanced UART Framing error detection Automatic address recognition; (14)Power control modes Clock can be stopped and resumed Idle mode Power down mode; (15)Programmable clock out; (16)Second DPTR register; (17)Asynchronous port reset; (18)Low EMI (inhibit ALE); (19)Programmable Counter Array (PCA) PWM Capture/compare.

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