Datasheet

872
32072H–AVR32–10/2012
AT32UC3A3
32.4.3 Interrupt Controller
MSI interrupt line is connected to the Interrupt Controller. In order to handle interrupts, Interrupt
Controller(INTC) must be programmed before configuring MSI.
32.4.4 DMA Controller (DMACA)
Handshake signals are connected to DMACA. In order to accelerate transfer from/to flash card,
DMACA must be programmed before using MSI.
32.5 Connection to a Memory Stick
The Memory Stick serial clock (SCLK) is maximum 20 MHz in serial mode, and maxi-
mum 40 MHz in parallel mode. SCLK is derived from peripheral clock (CLK_MSI) :
f_SCLK = f_CLK_MSI / [2*(CLKDIV+1)] where CLKDIV = {0..255}.
Pin DATA[1] is a power supply for some Memory Stick version, so leaving the pull-
down resistor connected may result in wasteful current consumption. User should leave
the DATA[1] pin pull-down open when Memory Stick Ver. 1.x is inserted.
Table 32-1. Memory Stick pull-down configuration
Figure 32-4. Memory Stick pull-down overview
Memory Stick 1.x Memory Stick PRO
Memory Stick inserted Pull-down open Pull-down enabled
Memory Stick removed Pull-down enabled Pull-down enabled