FEATURES
• 80C51 central processing unit
• 8k × 8 EPROM expandable externally to
64k bytes
• An additional 16-bit timer/counter coupled
to four capture registers and three compare
registers
• Two standard 16-bit timer/counters
• 256 × 8 RAM, expandable externally to 64k
bytes
• Capable of producing eight synchronized,
timed outputs
• A 10-bit ADC with eight multiplexed analog
inputs
• Two 8-bit resolution, pulse width
modulation outputs
• Five 8-bit I/O ports plus one 8-bit input port
shared with analog inputs
• I
2C-bus serial I/O port with byte oriented
master and slave functions
• Full-duplex UART compatible with the
standard 80C51
• On-chip watchdog timer
• 16MHz speed
• Extended temperature ranges
• OTP package available
DESCRIPTION
The 87C552 Single-Chip 8-Bit Microcontroller
is manufactured in an advanced CMOS
process and is a derivative of the 80C51
microcontroller family. The 87C552 has the
same instruction set as the 80C51. Three
versions of the derivative exist:
• 83C552—8k bytes mask programmable
ROM
• 80C552—ROMless version of the 83C552
• 87C552—8k bytes EPROM
The 87C552 contains a 8k × 8 a volatile
256 × 8 read/write data memory, five 8-bit I/O
ports, one 8-bit input port, two 16-bit
timer/event counters (identical to the timers of
the 80C51), an additional 16-bit timer coupled
to capture and compare latches, a 15-source,
two-priority-level, nested interrupt structure,
an 8-input ADC, a dual DAC pulse width
modulated interface, two serial interfaces
(UART and I2C-bus), a “watchdog” timer and
on-chip oscillator and timing circuits. For
systems that require extra capability, the
87C552 can be expanded using standard
TTL compatible memories and logic.
In addition, the 87C552 has two software
selectable modes of power reduction—idle
mode and power-down mode. The idle mode
freezes the CPU while allowing the RAM,
timers, serial ports, and interrupt system to
continue functioning. The power-down mode
saves the RAM contents but freezes the
oscillator, causing all other chip functions to
be inoperative.
The device also functions as an arithmetic
processor having facilities for both binary and
BCD arithmetic plus bit-handling capabilities.
The instruction set consists of over 100
instructions: 49 one-byte, 45 two-byte, and
17 three-byte. With a 16MHz crystal, 58% of
the instructions are executed in 0.75µs and
40% in 1.5µs. Multiply and divide instructions
require 3µs.
ORDERING INFORMATION
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方向:
Single-chip 8-bit microcontroller
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