DS87C520_1 Datasheet, PDF (2/42 Pages) Dallas Semiconductor – EPROM/ROM High-Speed Micro

DS87C520/DS83C520
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
DS87C520-MCL 40-pin plastic DIP
33 MHz
DS87C520-QCL 44-pin PLCC
33 MHz
DS87C520-ECL 44-pin TQFP
33 MHz
DS87C520-MNL 40-pin plastic DIP
33 MHz
DS87C520-QNL 44-pin PLCC
33 MHz
DS87C520-ENL 44-pin TQFP
33 MHz
DS87C520-WCL 40-pin windowed CERDIP
33 MHz
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
0°C to 70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
0°C to 70°C
DS83C520 -M C L
DS83C520 -QCL
DS83C520 - ECL
DS83C520 -M N L
DS83C520 -Q N L
DS83C520 - E N L
40-pin plastic DIP
44-pin PLCC
44-pin TQFP
40-pin plastic DIP
44-pin PLCC
44-pin TQFP
33 MHz
33 MHz
33 MHz
33 MHz
33 MHz
33 MHz
2 of 42
0°C to 70°C
0°C to 70°C
0°C to 70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C