Features: •80C51 based architecture 4k ×8 EPROM (87C550)/ROM (83C550) 128 ×8 RAM Eight channels of 8-bit A/D Two 16-bit counter/timers Watchdog timer Full duplex serial channel Boolean processor•Memory addressing capability 64k ROM and 64k RAM•Power control modes: Idle mode Power...
83C550: Features: •80C51 based architecture 4k ×8 EPROM (87C550)/ROM (83C550) 128 ×8 RAM Eight channels of 8-bit A/D Two 16-bit counter/timers Watchdog timer Full duplex serial channel Boolean process...
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PARAMETER | RATING | UNIT |
Operating temperature under bias | 40 to +85 | °C |
Storage temperature range | 65 to +150 | °C |
Voltage on EA /VPPpin to VSS(87C550 only) | 0 to +13.0 | V |
Voltage on any other pin to VSS | 0.5 to +6.5 | V |
Input, output current on any two I/O pins | ±10 | mA |
Power dissipation (based on package heat transfer limitations, not device power consumption) | 1.5 | W |
The 8XC550 contains a 4k * 8 EPROM (87C550)/ROM(83C550)/ROMless (80C550 has no program memory on-chip), a128 * 8 RAM, 8 channels of 8-bit A/D, four 8-bit ports (port 1 is inputonly), awatchdogtimer,two16bitcounter/timers, a seven-source,two-priority level nested interrupt structure, a serial I/O port for either multi-processor communications, I/O expansion or full duplex UART,and an on-chip oscillator and clock circuits.
In addition, the 8XC550 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 port, 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.