CDP68HC68T1EZ

CDP68HC68T1EZ is a real-time clock provides a time/calendar function, a 32byte static RAM, and a 3 wire serial peripheral interface (SPI bus). The primary function of the clock is to divide down a frequency input that can be supplied by the on-board oscillator in conjunction with an external crystal or by an external clock source. The internal oscillator can operate with a 32KHz, 1MHz, 2MHz, or 4MHz crystal. An external clock source with a 32KHz, 1MHz, 2MHz, 4MHz, 50Hz or 60Hz frequency can be used to drive the CDP68HC68T1. 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 BCD format. In addition, 12 or 24 hour operation can be selected. In 12 hour mode, an AM/PM indicator is provided. The T1 has a programmable output which can provide one of seven outputs for use elsewhere in the system.

• Full clock features sec, minutes, hours (12/24, AM/PM), day, date, month, year, automatic leap year
• 32 wordx8bit RAM
• Seconds, minutes, hours alarm
• Automatic power loss detection
• Low minimum standby (timekeeping) voltage 2.2V
• Selectable crystal or 50/60Hz line input
• Buffered clock output
• Battery input pin that powers oscillator and also connects to VDD pin when power fails
• Three independent interrupt modes (alarm, periodic, power-down sense)
• 16 lead PDIP package, -40 to +85°C temperature range

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