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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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MC68HC68T1 Real-Time Clock plus RAM with Serial Interface
CMOS
The MC68HC68T1 HCMOS Clock/RAM peripheral contains a real–time clock/calendar, a 32 x 8 static RAM, and a synchronous, serial, three–wire interface for communication with a microcontroller or processor. Operating in a burst mode, successive Clock/RAM locations can be read or written using only a single starting address. An on–chip oscillator allows acceptance of a selectable crystal frequency or the device can be programmed to accept a 50/60 Hz line input frequency. The LINE and system voltage (VSYS) pins give the MC68HC68T1 the capability for sensing power–up/power–down conditions, a capability useful for battery–backup systems.
MC68HC68T1 Datasheet
