DS87C550 ,EPROM High-Speed Micro with A/D and PWMFEATURES PIN ASSIGNMENT § 87C52-Compatible 61 9 1 - 8051 pin- and instruction set-compatible - T ..
DS87C550KCL ,EPROM High-Speed Micro with A/D and PWMfeatures that can significantly reduce electromagnetic interference (EMI).One EMI reduction feature ..
DS87C550QCL ,EPROM High-Speed Micro with A/D and PWMFEATURES PIN ASSIGNMENT§ 87C52-Compatible19 61- 8051 pin- and instruction set-compatible- Three 16- ..
DS87C550-QNL ,EPROM High-Speed Micro with A/D and PWMfeatures 8 kbytes of EPROM with anextra 1 kbyte of data RAM (in addition to the 256 bytes of scratc ..
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DS87C550
EPROM High-Speed Micro with A/D and PWM
FEATURES § 87C52-Compatible - 8051 pin- and instruction set-compatible Three 16-bit timer/counters - 256 bytes scratchpad RAM
§ On-chip Memory 8 kB EPROM (OTP & Windowed Packages) 1 kB extra on-chip SRAM for MOVX access § On-chip Analog to Digital Converter - Eight channels of analog input, 10-bit
resolution Fast conversion time Selectable internal or external reference voltage
§ Pulse-Width Modulator Outputs Four channels of 8-bit PWM Channels cascadable to 16-bit PWM § Four capture plus three compare registers § 55 I/O Port Pins
§ New Dual Data Pointer Operation Either data pointer can be incremented or
decremented § ROMSIZE Feature Selects effective on-chip ROM size from 0 to 8k Allows access to entire external memory map Dynamically adjustable by software § High-Speed Architecture 4 clocks/machine cycle (8051 = 12) Runs DC to 33 MHz clock rates Single-cycle instruction in 121 ns - New Stretch Cycle feature allows access to fast/slow memory or peripherals
§ Unique Power Savings Modes
§ EMI Reduction Mode disables ALE when not
needed § High integration controller includes: Power-fail reset Early-warning power-fail interrupt - Two full-duplex hardware serial ports Programmable watchdog timer § 16 total interrupt sources with six external
§ Available in 68-pin PLCC, 80-pin PQFP, and
68-pin windowed CLCC
PIN ASSIGNMENT
EPROM High-Speed Micro10
26
60
44
68-Pin PLCC
68-Pin Windowed CLCC
DS87C550
DESCRIPTION The DS87C550 EPROM High-Speed Micro with ADC 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 DS87C550
DS87C550 BLOCK DIAGRAM Figure 1 DS87C550
PIN DESCRIPTION Table 1
DS87C550
