DESCRIPTION
The programmable SH3000 MicroBuddy™ (µBuddy™) provides all mandatory microcontroller support functions: ♦ CPU Supervisor ♦ Clock Management System ♦ Real Time Support ♦ Auxiliary functions Three components make a complete system: any microcontroller, the SH3000, and a bypass capacitor. A fourth component, a 32.768 kHz watch crystal, raises the clock frequency accuracy to ± 0.0256% (± 256 ppm). A single-wire interface handles both bi-directional communications and the interrupt / wake-up signal from the SH3000. The SH3000 stores all configuration, calibration, parameters, and status information in a 36-byte bank of control registers. On reset, most of these are reloaded with defaults from the factory-set One-Time-Programmable (OTP) memory. The microcontroller can change any settings on the fly. If some of the settings must remain fixed, a comprehensive set of write-protect bits is provided for several related groups of registers (with both permanent write-inhibit and lock/unlock capabilities).
Semtech Corporation
