AT83C51SND1C_14 Datasheet, PDF (1/2 Pages) ATMEL Corporation – AT83C51SND1C Errata Description

Active AT83C51SND1C Errata List
• SPI Controller – Bad Transfer in Slave Mode with CPHA = 0
• C51 Core – Bad Exit of Power-down in X2 Mode
• MP3 Decoder – Extra Power Consumption after Reset
AT83C51SND1C Errata History
Lot Number
All lot numbers
Errata List
1, 2, 3
AT83C51SND1C Errata Description
1. SPI Controller – Bad Transfer in Slave Mode with CPHA = 0
SPI controller used in slave mode with CPHA = 0 leads to erratic data reception
and transmission.
Workaround
Use slave mode only with CPHA = 1.
2. C51 Core – Bad Exit of Power-down in X2 Mode
When exiting Power-down mode by interrupt while CPU is in X2 mode, it leads to
bad execution of first instruction executed when CPU restarts.
Workaround
Put the CPU in X1 mode just before entering power-down mode.
3. MP3 Decoder – Extra Power Consumption after Reset
Under certain power-up conditions, MP3 decoder may not be well reset leading to
an extra power consumption. This extra consumption disappears after playing one
MP3 song.
Workaround
The software workaround consists of enabling and disabling the MP3 macrocell
while PLL is running. This starts internal decoder reset process and removes the
extra power consumption.
Implemented in latest firmware packages.
MP3
Microcontrollers
AT83C51SND1C
Errata Sheet
Rev. 4255A–MP3–08/03