DS87C550 datasheet(2/50 Pages) DALLAS

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DS87C550

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DESCRIPTION

The DS87C550 EPROM High-Speed Micro with A/D and PWM is a member of the fastest 100% 8051-

compatible microcontroller family available. It features a redesigned processor core that removes wasted

clock and memory cycles. As a result, it executes 8051 instructions up to three times faster than the

original architecture for the same crystal speed. The DS87C550 also offers a maximum crystal speed of

33 MHz, resulting in apparent execution speeds of up to 99 MHz.

The DS87C550 uses an industry standard 8051 pin-out and includes standard resources such as three

timer/counters, and 256 bytes of scratchpad RAM. This device also features 8 kbytes of EPROM with an

extra 1 kbyte of data RAM (in addition to the 256 bytes of scratchpad RAM), and 55 I/O ports pins. Both

One-Time-Programmable (OTP) and windowed packages are available.

Besides greater speed, the DS87C550 includes a second full hardware serial port, seven additional

interrupts, a programmable watchdog timer, brownout monitor, and power-fail reset.

The DS87C550 also provides dual data pointers (DPTRs) to speed block data memory moves. The user

can also dynamically adjust the speed of external accesses between two and 12 machine cycles for

flexibility in selecting memory and peripherals.

Power Management Mode (PMM) is useful for portable or battery-powered applications. This feature

allows software to select a lower speed clock as the main time base. While normal operation has a

machine cycle rate of 4 clocks per cycle, the PMM allows the processor to run at 1024 clocks per cycle.

For example, at 12 MHz, standard operation has a machine cycle rate of 3 MHz. In Power Management

Mode, software can select an 11.7 kHz (12 MHz/1024) machine cycle rate. There is a corresponding

reduction in power consumption due to the processor running slower.

The DS87C550 also offers two features that can significantly reduce electromagnetic interference (EMI).

One EMI reduction feature allows software to select a reduced emission mode that disables the ALE

signal when it is unneeded. The other EMI reduction feature controls the current to the address and data

pins interfacing to external devices producing a controlled transition of these signals.

ORDERING INFORMATION

PART NUMBER

PACKAGE

MAX. CLOCK SPEED

TEMPERATURE RANGE

DS87C550-QCL

68-pin PLCC

33 MHz

0°C to +70°C

DS87C550-FCL

80-pin PQFP

33 MHz

0°C to +70°C

DS87C550-QNL

68-pin PLCC

33 MHz

-40°C to +85°C

DS87C550-FNL

80-pin PQFP

33 MHz

-40°C to +85°C

DS87C550-KCL

68-pin windowed CLCC

33 MHz

0°C to 70°C

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