Description Microcontrollers 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. AT83C51SND1C Workaround Use slave mode only with CPHA = 1. Errata Sheet 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. Rev. 4255A­M