AT32UC3B064 Atmel Corporation, AT32UC3B064 Datasheet - Page 42
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AT32UC3B064
Manufacturer Part Number
AT32UC3B064
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT32UC3A0128.pdf
(377 pages)
2.AT32UC3A0128.pdf
(33 pages)
3.AT32UC3A0128.pdf
(159 pages)
4.AT32UC3B0128.pdf
(684 pages)
5.AT32UC3B0128.pdf
(107 pages)
Specifications of AT32UC3B064
Flash (kbytes)
64 Kbytes
Pin Count
64
Max. Operating Frequency
60 MHz
Cpu
32-bit AVR
# Of Touch Channels
32
Hardware Qtouch Acquisition
No
Max I/o Pins
44
Ext Interrupts
44
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device + OTG
Spi
4
Twi (i2c)
1
Uart
3
Ssc
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
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
16
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
3.0-3.6 or (1.65-1.95+3.0-3.6)
Operating Voltage (vcc)
3.0-3.6 or (1.65-1.95+3.0-3.6)
Fpu
No
Mpu / Mmu
Yes / No
Timers
10
Output Compare Channels
16
Input Capture Channels
6
Pwm Channels
13
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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- AT32UC3A0128 PDF datasheet
- AT32UC3A0128 PDF datasheet #2
- AT32UC3A0128 PDF datasheet #3
- AT32UC3B0128 PDF datasheet #4
- AT32UC3B0128 PDF datasheet #5
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5.2.3
5.2.4
42
AVR32
Page Table Organization
TLB organization
The MMU leaves the page table organization up to the OS software. Since the page table han-
dling and TLB handling is done in software, the OS is free to implement different page table
organizations. It is recommended, however, that the page table entries (PTEs) are of the format
shown in Figure 5-4. This allows the loaded PTE to be written directly into TLBELO, without the
need for reformatting. How the PTEs are indexed and organized in memory is left to the OS.
Figure 5-4.
The TLB is used as a cache for the page table, in order to speed up the virtual memory transla-
tion process. Up to two TLBs can be implemented, each with up to 64 entries. Each TLB is
configured as shown in
Figure 5-5.
The D, W and AP[1] bits are not implemented in ITLBs, since they have no meaning there.
The AP[0] bits are not implemented in DTLBs, since they have no meaning there.
The A bit is the Accessed bit. This bit is set when the TLB entry is loaded with a new value using
the tlbw instruction. It is cleared whenever the TLB matching process finds a match in the spe-
cific TLB entry. The A bit is used to implement pseudo-LRU replacement algorithms.
When an address look-up is performed by the TLB, the address section is searched for an entry
matching the virtual address to be accessed. The matching process is described in chapter
5.2.5.
Entry 63
Entry 0
Entry 1
Entry 2
Entry 3
31
Recommended Page Table Entry format
TLB organization
VPN[21:0]
VPN[21:0]
VPN[21:0]
VPN[21:0]
VPN[21:0]
Address section
Figure 5-5 on page
ASID[7:0]
ASID[7:0]
ASID[7:0]
ASID[7:0]
ASID[7:0]
PFN
42.
V
V
V
V
V
PFN[21:0]
PFN[21:0]
PFN[21:0]
PFN[21:0]
PFN[21:0]
Data section
C
C
C
C
C
10
G
G
G
G
G
C
9
B
B
B
B
B
8 7 6
G
AP[2:0]
AP[2:0]
AP[2:0]
AP[2:0]
AP[2:0]
B
AP
SZ[1:0]
SZ[1:0]
SZ[1:0]
SZ[1:0]
SZ[1:0]
4 3 2 1
32000D–04/2011
SZ
D
D
D
D
D
D
W
W
W
W
W
W
0
A
A
A
A
A
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