R40008 Atmel Corporation, R40008 Datasheet - Page 97
R40008
Manufacturer Part Number
R40008
Description
Manufacturer
Atmel Corporation
Datasheets
1.M40800.pdf
(284 pages)
2.M40800.pdf
(153 pages)
3.R40008.pdf
(19 pages)
4.R40008.pdf
(20 pages)
Specifications of R40008
Flash (kbytes)
0 Kbytes
Pin Count
100
Max. Operating Frequency
75 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
256
Self Program Memory
NO
External Bus Interface
1
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
3.3
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
3
Input Capture Channels
3
32khz Rtc
No
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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