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Table 18-1. RTC Specifications (Cont'd)
Feature
Core Data Access
DMA Data Access
DMA Channels
DMA Chaining
Boot Capable
Local Memory
Clock Operation
Features
The RTC interface has the following features.
• Provides a 1 Hz clock with Second, Minute, Hour and Day Coun-
ter (0 to 32767 days)
• Alarm Feature available with time of day interrupt
• Operates on a dedicated supply from an external 3.3 V battery
• Stopwatch function available
• Standard two pin interface with external 32.768 KHz crystal, 6 pF
capacitor on each pin and 100 MΩ resistor between the pins
• RTC Power switches to that of I/O Supply when chip is powered
on, saving battery life
• Calibration Feature available to correct time once a day; applica-
tion can use
18-2
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Availability
N/A
N/A
N/A
N/A
No
No
f
PCLK
pin to determine calibration settings
RTCXTALIN
ADSP-214xx SHARC Processor Hardware Reference
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