SAM7XC256 Atmel Corporation, SAM7XC256 Datasheet - Page 96
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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Memory Interface
3.6.4
3-26
Byte and halfword accesses
nMREQ
D[15:8]
A[31:0]
BL[3:0]
nWAIT
MCLK
D[7:0]
SEQ
APE
The processor indicates the size of a transfer by use of the MAS[1:0] signal as described
in MAS[1:0] on page 3-11.
Byte, halfword, and word accesses are described in:
•
•
Reads
When a halfword or byte read is performed, a 32-bit memory system can return the
complete 32-bit word, and the processor extracts the valid halfword or byte field from
it. The fields extracted depend on the state of the BIGEND signal, which determines
the endian configuration of the system. See Memory formats on page 2-4.
A word read from 32-bit memory presents the word value on the whole data bus as listed
in Table 3-7.
When connecting 8-bit to 16-bit memory systems to the processor, ensure that the data
is presented to the correct byte lanes on the core as listed in Table 3-7 on page 3-27.
Reads on page 3-26
Writes on page 3-27.
Copyright © 1994-2001. All rights reserved.
0xF
Figure 3-19 Two cycle memory access
0x2
ARM DDI 0029G
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