AT32UC3A4128 Atmel Corporation, AT32UC3A4128 Datasheet - Page 65
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AT32UC3A4128
Manufacturer Part Number
AT32UC3A4128
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT32UC3A0128.pdf
(377 pages)
2.AT32UC3A0128.pdf
(33 pages)
3.AT32UC3A0128.pdf
(159 pages)
4.AT32UC3A3128.pdf
(91 pages)
5.AT32UC3A3128.pdf
(1012 pages)
Specifications of AT32UC3A4128
Flash (kbytes)
128 Kbytes
Pin Count
100
Max. Operating Frequency
66 MHz
Cpu
32-bit AVR
Hardware Qtouch Acquisition
No
Usb Transceiver
1
Usb Speed
Hi-Speed
Usb Interface
Device + OTG
Spi
6
Twi (i2c)
2
Uart
4
Sd / Emmc
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
128
Self Program Memory
YES
Dram Memory
No
Nand Interface
Yes
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
3.0 to 3.6
Operating Voltage (vcc)
3.0 to 3.6
Fpu
No
Mpu / Mmu
Yes / No
Timers
6
Output Compare Channels
6
Input Capture Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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32002F–03/2010
bus latency may cause a memory access to be seen by a slave many cycles after it has been
executed by the pipeline. In some cases, this may lead to UNPREDICTABLE behavior in the
system.
One example of this is found in interrupt handlers. One usually wants to make sure that the inter-
rupt request has been cleared before executing the rete instruction, otherwise the same interrupt
may be serviced immediately after executing the rete instruction. In this case a DMB must be
inserted between the code clearing the interrupt request and the rete.
All accesses to HSB space are strongly ordered. This is used to implement DMBs. A DMB after
a store to a HSB slave is implemented by performing a dummy read from the same slave. Any
critical code after the read will stall until the read has been performed.
Consider an interrupt request made by a peripheral. This peripheral will disassert the interrupt
r e q u e s t a s s o o n a s t h e i n t e r r u p t h a n d l e r h a s w r i t t e n a s p e c i f i c b i t m a s k t o i t s
PERIPH_INTCLEAR register. A read from the same peripheral performs a bus transfer that
implements the DMB. The rete instruction can be executed after the DMB.
Code 6-1.
// Using data memory barriers in the IRQ handler to make sure that the
// request has been disasserted before returning from the handler
// Assume that the IRQ is cleared by writing a bitmask to PERIPH_INTCLEAR.
// r0 points to this register, r1 contains the correct bitmask.
irq_handler:
<some instructions>
st.w r0[0], r1
ld.w r12, r0[0] // data memory barrier
rete
Clearing IRQs using data memory barriers
AVR32
65