ATJ2085 ETC, ATJ2085 Datasheet - Page 18

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

ATJ2085
4.11 Headphone Driver
4.12 Key Scan Interface
4.13 External Memory Interface
Copyright © 2004 Actions Semiconductor Co., Ltd. All rights reserved.
The output power of ATJ2085’s amplifier is 13mW(each channel).
VER 1.5
When key scan circuit is enabled, ATJ2085 will scan the keyboard periodically. It drives pin Key
out N scan pulse in turn. When any key is pressed, the corresponding Key out N will send out the
scan pulse. When a key is pressed, pin Key in N connecting the key will be found low level.
There are 12 internal 8-bit registers for key value latch per scan. But only another one register
(Key Scan Data Register) for MCU may access key value. Those 12 internal registers are
mapped into this register, and an internal pointer is used to point to the current register to return
scan data when read. Any IO write to this register will clear the internal register, and the pointer
will increase by 1 and point to the next register after read is performed.
ATJ2085 can support NAND type flash from 32M to 1G bytes.
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Page 17
DATA SHEET
8/18/2004
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