AT32UC3A3128 Atmel Corporation, AT32UC3A3128 Datasheet - Page 41

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AT32UC3A3128

Manufacturer Part Number
AT32UC3A3128
Description
Manufacturer
Atmel Corporation

Specifications of AT32UC3A3128

Flash (kbytes)
128 Kbytes
Pin Count
144
Max. Operating Frequency
66 MHz
Cpu
32-bit AVR
# Of Touch Channels
32
Hardware Qtouch Acquisition
No
Max I/o Pins
110
Ext Interrupts
110
Usb Transceiver
1
Usb Speed
Hi-Speed
Usb Interface
Device + OTG
Spi
6
Twi (i2c)
2
Uart
4
Lin
4
Ssc
1
Sd / Emmc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
384
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
16
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
128
Self Program Memory
YES
External Bus Interface
1
Dram Memory
sdram
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
18
Input Capture Channels
12
Pwm Channels
12
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes

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5.2.2.6
32000D–04/2011
TLB Accessed Register HI / LO - TLBARHI / TLBARLO
Table 5-4.
The TLBARHI and TLBARLO register form one 64-bit register with 64 1-bit fields. Each of these
fields contain the Accessed bit for the corresponding TLB entry. The I bit in TLBEHI determines
whether the ITLB or DTLB Accessed bits are read. The Accessed bit is 0 if the page has been
accessed, and 1 if it has not been accessed. Bit 31-0 in TLBARLO correspond to TLB entry 0-
31, bit 31-0 in TLBARHI correspond to TLB entry 32-63. If the TLB implementation contains less
than 64 entries then nonimplemented entries are read as 0.
Note: The contents of TLBARHI/TLBARLO are reversed to let the Count Leading Zero (CLZ)
instruction be used directly on the contents of the registers. E.g. if CLZ returns the value four on
the contents of TLBARLO, then item four is the first unused item in the TLB.
M
0
1
• ILA - Instruction TLB Lockdown Amount. Specified the number of locked down ITLB entries.
• DRP - Data TLB Replacement Pointer. Points to the DTLB entry to overwrite when a new
• DLA - Data TLB Lockdown Amount. Specified the number of locked down DTLB or UTLB
• S - Segmentation Enable. If set, the segmented memory model is used in the translation
• N - Not Found. Set if the entry searched for by the TLB Search instruction (tlbs) was not
• I - Invalidate. Writing this bit to one invalidates all TLB entries. The bit is automatically cleared
• M - Mode. Selects whether the shared virtual memory mode or the private virtual memory
• E - Enable. If set, the MMU translation is enabled. If cleared, the MMU translation is disabled
entries in the ITLB. It is IMPLEMENTATION DEFINED whether to use fewer entries.
Impementations with a single unified TLB does not use the IRP field.
All ITLB entries from entry 0 to entry (ILA-1) are locked down. If ILA equals zero, no entries
are locked down. Implementations with a single unified TLB does not use the ILA field.
entry is loaded by the tlbw instruction. The DRP field may be updated automatically in an
IMPLEMENTATION DEFINED manner in order to optimize the replacement algorithm. The
DRP field can also be written by software, allowing the exception routine to implement a
replacement algorithm in software. The DRP field is 6 bits wide, allowing a maximum of 64
entries in the DTLB. It is IMPLEMENTATION DEFINED whether to use fewer entries.
Implementations with a single unified TLB use the DRP field to point into the unified TLB.
entries. All DTLB entries from entry 0 to entry (DLA-1) are locked down. If DLA equals zero,
no entries are locked down.
process. If cleared, the memory is regarded as unsegmented. The S bit is set after reset.
found in the TLB.
by the MMU when the invalidate operation is finished.
mode should be used. The M bit determines how the TLB address comparison should be
performed, see
and the physical address is identical to the virtual address. Access permissions are not
checked and no MMU-related exceptions are issued if the MMU is disabled. If the MMU is
disabled, the segmented memory model is used.
MMU mode implied by the M bit
Table 5-4 on page
Mode
Private Virtual Memory
Shared Virtual Memory
41.
AVR32
41

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