The datasheet introduces the features of the DS87C530/DS83C530 chip.
The DS87C530 and DS83C530 are high‑speed 8051‑compatible microcontrollers from Maxim (formerly Dallas Semiconductor). They operate with four clocks per machine cycle, offering up to 33 MHz clock speed, and include on‑chip EPROM/ROM, a real‑time clock with battery backup, and 1 kB of extra SRAM for MOVX operations. The devices are suited for instrumentation and portable applications and support a range of peripherals such as two full‑duplex serial ports, three 16‑bit timers/counters, and multiple I/O ports.
Key features include 16 kB EPROM (OTP) for the DS87C530, a mask‑ROM version for the DS83C530, power‑management mode with selectable clock division, EMI‑reduction mode, and extensive pin‑out options in PLCC, TQFP, and windowed CLCC packages. External components required for the RTC are a 32.768 kHz crystal and a backup battery or super‑capacitor.
| On‑Chip Memory | 16 kB EPROM (OTP) |
|---|---|
| Extra SRAM | 1 kB |
| Serial Ports | Two full‑duplex hardware serial ports |
| Timers / Counters | Three 16‑bit timer/counters |
| I/O Ports | Four 8‑bit I/O ports (Port 0‑3) |
An external 32.768 kHz crystal and a backup battery or super‑capacitor must be provided to keep the RTC powered.
The device includes two independent full‑duplex hardware serial ports.
One machine cycle requires four clocks, giving a 121 ns cycle (8.25 MIPS) at 33 MHz.