AT91SAM9G10-EK Atmel, AT91SAM9G10-EK Datasheet - Page 712

• Manufacturer Part Number: AT91SAM9G10-EK
• Description: KIT DEV FOR SAM9G10 ARM
• Manufacturer: Atmel
• Type: MCUr

Specifications of AT91SAM9G10-EK

• Contents: Board, Cables, Power Supply
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Kit Contents: Board
• Svhc: No SVHC (15-Dec-2010)
• Mcu Supported Families: AT91SAM9G10, ARM926EJ-S
• Tool / Board Applications: Microcontroller
• Rohs Compliant: Yes
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

42.2
42.2.1
42.2.1.1
42.2.2
42.2.2.1
42.2.3
42.2.3.1
712
AT91SAM9G10 Errata - Revision A Parts
AT91SAM9G10
Battery Backup
Bus Matrix
LCD
Backup Overconsumption During AHB Masters Activity
Bus Matrix: Problem with Locked Transfers
LCD: Screen Shifting After a Reset
Refer to
Conditions:
During AHB Masters activity (LCD DMA, USB Host DMA, etc.) the backup current can rise up to
12 µA @ 25⋅ C.
Figure 42-1 on page 712
when the main power supply is off. In active mode, the clocks of unused peripherals should be
disabled through the Power Management Controller to save power.
Figure 42-1. Schematic
Locked transfers are not correctly handled by the Bus Matrix and can lead to a system freeze
up. This does not concern ARM locked transfers.
Avoid other Bus Matrix masters locked transfers.
When a FIFO underflow occurs, a reset of the LCD DMA and FIFO pointers is necessary.
If only LCD DMA pointers are reset (FIFO pointers not reset), the displayed image is shifted.
Apply the following sequence to correctly reset LCD DMA and FIFO pointers:
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
Section 42.1 “Marking” on page
J1
CR1225
Z1
+
3V
shows how to feed the backup part of the chip from the battery only
MMBD1704A
R1
CR1
1K
711.
3V3
3
C1
100NF
MN1
R1100D121C
C2
100NF
VDDBU
6462A–ATARM–03-Jun-09