J
[email protected]
- Jan 1, 1970
- 0
DESCRIPTION
The DS87C520/DS83C520 EPROM/ROM high-speed microcontrollers are
fast 8051-compatible
microcontrollers. They feature a redesigned processor core without
wasted clock and memory cycles. As a result, the devices execute 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 offer a maximum crystal speed of 33MHz, resulting in
apparent execution speeds of 82.5MHz (approximately 2.5X).
The DS87C520/DS83C520 are pin compatible with all three packages of
the standard 8051, and include standard resources such as three timer/
counters, serial port, and four 8-bit I/O ports. They feature 16kB of
EPROM or mask ROM with an extra 1kB 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, Brownout 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 12MHz, standard operation has a machine cycle rate of
3MHz. In Power Management Mode, software can select either 187.5kHz or
11.7kHz 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 16kB 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.
The DS87C520/DS83C520 EPROM/ROM high-speed microcontrollers are
fast 8051-compatible
microcontrollers. They feature a redesigned processor core without
wasted clock and memory cycles. As a result, the devices execute 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 offer a maximum crystal speed of 33MHz, resulting in
apparent execution speeds of 82.5MHz (approximately 2.5X).
The DS87C520/DS83C520 are pin compatible with all three packages of
the standard 8051, and include standard resources such as three timer/
counters, serial port, and four 8-bit I/O ports. They feature 16kB of
EPROM or mask ROM with an extra 1kB 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, Brownout 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 12MHz, standard operation has a machine cycle rate of
3MHz. In Power Management Mode, software can select either 187.5kHz or
11.7kHz 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 16kB 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.
