AT89C5131_14 Datasheet, PDF (1/5 Pages) ATMEL Corporation – 32-Kbyte On-chip Flash In-System Programming through USB or UART

Active Errata List
• USB – Ping-Pong databank 1 Re-transmission Failure
• USB – Ping-Pong OUT Bad Reception
• USB – Bad Remote Wake-up Generation
• UART Interface – During Reception, Clearing REN may Generate Unexpected IT
• C51 Core – Power-down Exit Failure in X2 Mode
• Timer 0/1 – Unexpected Interrupt
• USB Interface – CPU Wake-up Interrupt not Cleared if CPU Frequency Greater or Equal
than 12 MHz/X2
• USB Interface – Data Corruption in Endpoint0 and FIFO
• Timer 2 – Baud Rate Generator – Long Start Time
• Timer 1 in Mode 1 Does Not Generate Baud Rate to UART
• Wrong Latch of Hardware Conditions
• Bad Suspend Resume Initialization
• Stretch MOVX Does Not Work
Errata History
Lot Number
A5560 or above
Errata List
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,14
USB
Microcontrollers
AT89C5131
Errata Sheet
Errata Description
1. USB – Ping-Pong Databank 1 Re-transmission Failure
When the host does not acknowledge an IN data packet from the databank 1 of a
ping-pong endpoint, the endpoint retry-mechanism sends corrupted data.
Workaround
None.
2. USB - Ping-Pong OUT Bad Reception
When the host sends a packet with a size lower than the size defined in the
DPRAM endpoint (Ping-Pong Only), there is a risk of having a corrupted packet in
the DPRAM with a wrong number of bytes reported. This problem occurs only in
Ping-Pong mode if the 2 banks are full and bank 1 is cleared when the host is
sending a packet at that time. If the packets are of the size of the DPRAM end-
point, there is no problem even in Ping-Pong mode.
If the device application software is quick enough to read the received packets to
avoid the case where the 2 banks are full, there is no problem even if the packet
sizes are not of the same size of the DPRAM endpoint.
Workaround
None.
3. USB - Bad Remote Wake-up Generation
The remote wake-up generates an SE0 and J state (at the end of the Upstream
Resume K) that are reserved by the Host.
Workaround
None.
4. UART Interface – During Reception, Clearing REN may Generate Unex-
pected IT
4286E–USB–03/08