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P87C54UFBB

80C51 8-bit microcontroller family 8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V), low power, high speed (33 MHz)

NXP Semiconductors. 

Philips Semiconductors

80C51 8-bit microcontroller family

8K–64K/256–1K OTP/ROM/ROMless, low voltage (2.7V–5.5V),

low power, high speed (33 MHz)

Product specification

8XC54/58

8XC51FA/FB/FC/80C51FA

8XC51RA+/RB+/RC+/RD+/80C51RA+

DESCRIPTION

Three different Single-Chip 8-Bit Microcontroller families are

presented in this datasheet:

• 8XC54/8XC58

• 80C51FA/8XC51FA/8XC51FB/8XC51FC

• 80C51RA+/8XC51RA+/8XC51RB+/8XC51RC+/8XC51RD+

For applications requiring 4K ROM/EPROM, see the 8XC51/80C31

8-bit CMOS (low voltage, low power, and high speed)

microcontroller families datasheet.

All the families are Single-Chip 8-Bit Microcontrollers manufactured

in advanced CMOS process and are derivatives of the 80C51

microcontroller family. All the devices have the same instruction set

as the 80C51.

These devices provide architectural enhancements that make them

applicable in a variety of applications for general control systems.

ROM/EPROM

Memory Size

(X by 8)

RAM Size

(X by 8)

Programmable

Timer Counter

(PCA)

80C31/8XC51

0K/4K

128

No

8XC54/58

0K/8K/16K/32K

256

No

80C51FA/8XC51FA/FB/FC

0K/8K/16K/32K

256

Yes

80C51RA+/8XC51RA+/RB+/RC+

0K/8K/16K/32K

512

Yes

8XC51RD+

64K

1024

Yes

Hardware

Watch Dog

Timer

No

No

No

Yes

Yes

The ROMless devices, 80C51FA, and 80C51RA+ can address up to

64K of external memory. All the devices have 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. For systems that require extra memory capability

up to 64k bytes, each can be expanded using standard

TTL-compatible memories and logic.

Its added features make it an even more powerful microcontroller for

applications that require pulse width modulation, high-speed I/O and

up/down counting capabilities such as motor control. It also has a

more versatile serial channel that facilitates multiprocessor

communications.

FEATURES

• 80C51 Central Processing Unit

• Speed up to 33 MHz

• Full static operation

• Operating voltage range: 2.7 V to 5.5 V @ 16 MHz

• Security bits:

– ROM – 2 bits

– OTP–EPROM – 3 bits

• Encryption array – 64 bytes

• RAM expandable to 64K bytes

• 4 level priority interrupt

• 6 or7 interrupt sources, depending on device

• 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)

2000 Aug 07

2

853-2068 24292

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