ATJ2085 ETC, ATJ2085 Datasheet - Page 14

• Manufacturer Part Number: ATJ2085
• Description: Atj2085 is a Single-chip for Flash-based Digital Music Player
• Manufacturer: ETC

ATJ2085
4.6 RTC/CTC/Watch Dog Timer
4.7 Oscillator/PLL
Copyright © 2004 Actions Semiconductor Co., Ltd. All rights reserved.
VER 1.5
RTC is a 24-bit counter with the following function:
CTC is a counter whose clock source is different with RTC’s.
Watchdog can be set from 176-milisecond to 180-second with different step.
ATJ2085 supports 24.576MHz crystal, which is the system clock source.
A low jitter PLL referenced to 24.576MHz is used to generate clock for DSP and for serial
communication protocols such as USB, UART, etc. The clock used in serial communications is
48MHz so the PLL generates frequency at multiple of 48MHz to support DSP and serial
communication simultaneously. Another PLL referenced to 24.576MHz is used to generate
22.5792MHz for sample rate 44.1K/22.05KHz/11.025KHz.
Time
Alarm
Timer
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Page 13
DATA SHEET
8/18/2004
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