R40008 Atmel Corporation, R40008 Datasheet - Page 79
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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3.3.5
ARM DDI 0029G
Coprocessor register transfer cycles
When designing a memory controller, ensure that the design also works when an I-cycle
is followed by an N-cycle to a different address. This sequence can occur during
exceptions, or during writes to the PC. It is essential that the memory controller does
not commit to the memory cycle during an I-cycle.
During a coprocessor register transfer cycle, the ARM7TDMI processor uses the data
buses to transfer data to or from a coprocessor. A memory cycle is not required and the
memory controller does not initiate a transaction. The memory system must not drive
onto the data bus during a coprocessor register transfer cycle.
The coprocessor interface is described in Chapter 4 Coprocessor Interface. The
coprocessor register transfer cycle is shown in Figure 3-6 on page 3-10.
Note
Copyright © 1994-2001. All rights reserved.
nMREQ
A[31:0]
D[31:0]
MCLK
nRAS
nCAS
SEQ
I-cycle
Figure 3-5 Merged IS cycle
S-cycle
Memory Interface
3-9
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