PT8401 Datasheet, PDF (14/28 Pages) Princeton Technology Corp – MP3 Audio Decoder

Princeton Technology Corp.
MP3 Audio Decoder
Tel : [phone]
Fax: [phone]
URL: http://www.princeton.com.tw
PT8401
allowable, but PT8401 only receives it and does nothing. PT8401 is capable of the following read
operations: Word Read, Multi-byte Read and Repeat Address Read Modes. In the Repeat Address Read
Mode, the last successful transmitted address is read again even if the decoder has not been informed of the
address. This mode is usually used for the address 0x00, FrameCount, which maybe the most frequently
requested address in all command registers. In PT8401, only the command AncillaryData is allowed to use
the Multi-byte Read Mode. Since A, no acknowledge signal is controlled by the receiver (microcontroller)
in the read mode, the microcontroller will receive repeated data after 3^rd byte in other command registers in
Multi-byte Read Mode.
Word Write ^{S D ev_addr} W ^{A Sub_addr A high_byte A low _byte A P}
Word Read ^{S D ev_addr} W ^{A Sub_addr A S D ev_addr R} A ^{high_byte A low _byte} A ^P
Multi-byte Read S D ev_addr W A Sub_addr A S D ev_addr R A 1st_byte A 2nd_byte A
Repeat Address
Read
S D ev_addr R A high_byte A low _byte A P
A Last_byte A P
Figure 9: Read and Write Sequence for I²C Protocol.
POWER DOWN SETTING
To enter the Power Down Mode, Pin 40 (PWRDWN_) must be set to “LOW’. The DSPRDY pin
goes to low, this indicates that PT8401 is already been powered down. There are two types of Power
Down Modes, namely: Sleep Mode and the Deep Sleep Mode. The Sleep Mode turns off the DSP
clock and only preserves PLL clock. The Deep Sleep on the other hand turns off DSP and PLL clock.
All the commands that have been previously set will preserved. PT8401’s default is the sleep mode.
With the command Pwr_Dwn_Reg set to 0x04 before power down, deep sleep is achieved.
PT8401 v 1.3
Page 14
Updated March 2002