SAM9XE128 Atmel Corporation, SAM9XE128 Datasheet - Page 112
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SAM9XE128
Manufacturer Part Number
SAM9XE128
Description
Manufacturer
Atmel Corporation
Datasheets
1.SAM9260.pdf
(290 pages)
2.SAM9261.pdf
(248 pages)
3.SAM9XE128.pdf
(860 pages)
4.SAM9XE128.pdf
(48 pages)
Specifications of SAM9XE128
Flash (kbytes)
128 Kbytes
Pin Count
217
Max. Operating Frequency
180 MHz
Cpu
ARM926
Hardware Qtouch Acquisition
No
Max I/o Pins
96
Ext Interrupts
96
Usb Transceiver
3
Usb Speed
Full Speed
Usb Interface
Host, Device
Spi
2
Twi (i2c)
2
Uart
6
Ssc
1
Ethernet
1
Sd / Emmc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
Yes
Adc Channels
4
Adc Resolution (bits)
10
Adc Speed (ksps)
312
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
16
Self Program Memory
NO
External Bus Interface
1
Dram Memory
sdram
Nand Interface
Yes
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8/3.3
Operating Voltage (vcc)
1.65 to 1.95
Fpu
No
Mpu / Mmu
No / Yes
Timers
6
Output Compare Channels
6
Input Capture Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
No
- SAM9260 PDF datasheet
- SAM9261 PDF datasheet #2
- SAM9XE128 PDF datasheet #3
- SAM9XE128 PDF datasheet #4
- Current page: 112 of 290
- Download datasheet (5Mb)
Interrupts
5-4
takes the FIQ exception in a later cycle, even if the nFIQ input is subsequently
deasserted.
There are several approaches that you can adopt to ensure that interrupts are not enabled
too early on the ARM9E-S. The best approach is highly dependent on the overall
system, and can be a combination of hardware and software.
nFIQ or nIRQ) typically does not take effect until after the Memory stage of that
instruction. The instruction that re-enables interrupts on the ARM9E-S can cause the
ARM9E-S to be sensitive to interrupts as early as the Execute stage of that instruction.
For example, consider the following instruction sequence:
STR r0, [r1] ;Write to interrupt controller, clearing interrupt
SUBS pc, r14, #4 ;Return from interrupt routine
The execution of this code sequence is illustrated in Figure 5-1.
In Figure 5-1, the
nFIQ input until cycle 4. The
interrupts during cycle 3.
Because of this timing relationship, the ARM9E-S retakes the FIQ exception in this
example.
The FIQDIS (and similarly IRQDIS) output from the ARM9E-S indicates when the
ARM9E-S is sensitive to the state of the nFIQ (nIRQ) input (0 for sensitive, 1 for
insensitive). If nFIQ is asserted in the same cycle that FIQDIS is LOW, the ARM9E-S
STR r0, [r1]
SUBS pc, r14, #4
Copyright © 2000 ARM Limited. All rights reserved.
STR
to the interrupt controller does not cause the deassertion of the
SUBS
instruction causes the ARM9E-S to be sensitive to
Figure 5-1 Retaking the FIQ exception
ARM DDI 0165B
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