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DS87C520-QCL Datasheet(PDF) 2 Page - Dallas Semiconductor |
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DS87C520-QCL Datasheet(HTML) 2 Page - Dallas Semiconductor |
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2 / 42 page  DS87C520/DS83C520 2 of 42 DESCRIPTION The DS87C520/DS83C520 EPROM/ROM High-Speed Micro is a fast 8051-compatible microcontroller. It features a redesigned processor core without wasted clock and memory cycles. As a result, it executes every 8051 instruction between 1.5 and 3 times faster than the original for the same crystal speed. Typical applications will see a speed improvement of 2.5 times using the same code and the same crystal. The DS87C520/DS83C520 offers a maximum crystal speed of 33 MHz, resulting in apparent execution speeds of 82.5 MHz (approximately 2.5X). The DS87C520/DS83C520 is pin-compatible with all three packages of the standard 8051 and includes standard resources such as three timer/counters, serial port, and four 8-bit I/O ports. It features 16 kB of EPROM or Mask ROM with an extra 1 kB of data RAM. Both OTP and windowed packages are available. Besides greater speed, the microcontroller includes a second full hardware serial port, seven additional interrupts, programmable Watchdog Timer, Brown-out Monitor, and Power-Fail Reset. The device also provides dual data pointers (DPTRs) to speed block data memory moves. It also can adjust the speed of MOVX data memory access from two to nine machine cycles for flexibility in selecting external memory and peripherals. A new Power Management Mode (PMM) is useful for portable 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 runs the processor at 64 or 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 either 187.5 kHz or 11.7 kHz machine cycle rate. There is a corresponding reduction in power consumption when the processor runs slower. The EMI reduction feature allows software to select a reduced emission mode. This disables the ALE signal when it is unneeded. The DS83C520 is a factory Mask ROM version of the DS87C520 designed for high-volume, cost- sensitive applications. It is identical in all respects to the DS87C520, except that the 16 kB of EPROM is replaced by a user-supplied application program. All references to features of the DS87C520 will apply to the DS83C520, with the exception of EPROM-specific features where noted. Please contact your local Dallas Semiconductor sales representative for ordering information. ORDERING INFORMATION: DESCRIPTION PART NUMBER PACKAGE MAX. CLOCK SPEED TEMPERATURE RANGE DS87C520-MCL 40-pin plastic DIP 33 MHz 0°C to 70°C DS87C520-QCL 44-pin PLCC 33 MHz 0°C to 70°C DS87C520-ECL 44-pin TQFP 33 MHz 0°C to 70°C DS87C520-MNL 40-pin plastic DIP 33 MHz -40°C to +85°C DS87C520-QNL 44-pin PLCC 33 MHz -40°C to +85°C DS87C520-ENL 44-pin TQFP 33 MHz -40°C to +85°C DS87C520-WCL 40-pin windowed CERDIP 33 MHz 0°C to 70°C DS83C520-MCL 40-pin plastic DIP 33 MHz 0°C to 70°C DS83C520-QCL 44-pin PLCC 33 MHz 0°C to 70°C DS83C520-ECL 44-pin TQFP 33 MHz 0°C to 70°C DS83C520-MNL 40-pin plastic DIP 33 MHz -40°C to +85°C DS83C520-QNL 44-pin PLCC 33 MHz -40°C to +85°C DS83C520-ENL 44-pin TQFP 33 MHz -40°C to +85°C |
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