SAM7XC256 Atmel Corporation, SAM7XC256 Datasheet - Page 97
SAM7XC256
Manufacturer Part Number
SAM7XC256
Description
Manufacturer
Atmel Corporation
Specifications of SAM7XC256
Flash (kbytes)
256 Kbytes
Pin Count
100
Max. Operating Frequency
55 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
62
Ext Interrupts
62
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
2
Twi (i2c)
1
Uart
3
Can
1
Ssc
1
Ethernet
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 Resolution (bits)
No
Temp. Sensor
No
Crypto Engine
AES/DES
Sram (kbytes)
64
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
3.3
Operating Voltage (vcc)
3.0 to 3.6
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
3
Input Capture Channels
3
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
No
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ARM DDI 0029G
Access type
Word
Halfword
Byte
For subword reads the value is placed in the ARM register in the least significant bits
regardless of the byte lane used to read the data. For example, a byte read on A[1:0] =
01 in a little-endian system means that the byte is read on bits D[15:8] but is placed in
the ARM register bits [7:0].
Writes
When the ARM7TDMI processor performs a byte or halfword write, the data being
written is replicated across the data bus, as shown in Figure 3-20 on page 3-28. The
memory system can use the most convenient copy of the data.
A writable memory system must be capable of performing a write to any single byte in
the memory system. This capability is required by the ARM C Compiler and the debug
tool chain.
Note
MAS[1:0]
10
01
01
00
00
00
00
Copyright © 1994-2001. All rights reserved.
A[1:0]
XX
0X
1X
00
01
10
11
Little-endian BIGEND = 0
D[31:0]
D[15:0]
D[31:16]
D[7:0]
D[15:8]
D[23:16]
D[31:24]
Big-endian BIGEND = 1
D[31:0]
D[31:16]
D[15:0]
D[31:24]
D[23:16]
D[15:8]
D[7:0]
Table 3-7 Read accesses
Memory Interface
3-27
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