The CDP68HC68T1 Real-Time Clock provides atime/calendar function, a 32 byte static RAM, and a 3 wireSerial Peripheral Interface (SPI Bus). The primary function ofthe clock is to divide down a frequency input that can besupplied by the on-board oscillator in conjunction with anexternal crystal or by an external clock source. The internaloscillator can operate with a 32kHz, 1MHz, 2MHz, or 4MHzcrystal. An external clock source with a 32kHz, 1MHz, 2MHz,4MHz, 50Hz or 60Hz frequency can be used to drive theCDP68HC68T1. The time registers hold seconds, minutes,and hours, while the calendar registers hold day-of-week,date, month, and year information. The data is stored in BCDformat. In addition, 12 or 24 hour operation can be selected.In 12 hour mode, an AM/PM indicator is provided. The T1has a programmable output which can provide one of sevenoutputs for use elsewhere in the system.
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