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P89C51RD2 Datasheet(PDF) 2 Page - NXP Semiconductors

Part No. P89C51RD2
Description  80C51 8-bit Flash microcontroller family
Download  68 Pages
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com

P89C51RD2 Datasheet(HTML) 2 Page - NXP Semiconductors

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Philips Semiconductors
Preliminary data
80C51 8-bit Flash microcontroller family
8KB/16KB/32KB/64KB ISP/IAP Flash with 512B/512B/512B/1KB RAM
2002 Jul 18
The P89C51RA2/RB2/RC2/RD2xx contains a non-volatile
8KB/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 device supports 6-clock/12-clock mode selection by
programming a Flash bit using parallel programming or
In-System Programming. In addition, an SFR bit (X2) in the clock
control register (CKCON) also selects between 6-clock/12-clock
Additionally, when in 6-clock mode, peripherals may use either 6
clocks per machine cycle or 12 clocks per machine cycle. This
choice is available individually for each peripheral and is selected by
bits in the CKCON register.
This device is a Single-Chip 8-Bit Microcontroller manufactured in an
advanced CMOS process and is a derivative of the 80C51
microcontroller family. The instruction set is 100% compatible with
the 80C51 instruction set.
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 P89C51RA2/RB2/RC2/RD2xx make it a
powerful microcontroller for applications that require pulse width
modulation, high-speed I/O and up/down counting capabilities such
as motor control.
80C51 Central Processing Unit
On-chip Flash Program Memory with In-System Programming
(ISP) and In-Application Programming (IAP) capability
Boot ROM contains low level Flash programming routines for
downloading via the UART
Can be programmed by the end-user application (IAP)
Parallel programming with 87C51 compatible hardware interface
to programmer
Supports 6-clock/12-clock mode via parallel programmer (default
clock mode after ChipErase is 12-clock)
6-clock/12-clock mode Flash bit erasable and programmable via
6-clock/12-clock mode programmable “on-the-fly” by SFR bit
Peripherals (PCA, timers, UART) may use either 6-clock or
12-clock mode while the CPU is in 6-clock mode
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
Fully static operation
RAM expandable externally to 64 kbytes
Four interrupt priority levels
Seven 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 pin
Second DPTR register
Asynchronous port reset
Low EMI (inhibit ALE)
Programmable Counter Array (PCA)
– Capture/compare

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