R40008 Atmel Corporation, R40008 Datasheet - Page 74
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
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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Memory Interface
3.3
3-4
Bus cycle types
The ARM7TDMI processor bus interface is pipelined. This gives the maximum time for
a memory cycle to decode the address and respond to the access request:
•
•
A single memory cycle is shown in Figure 3-1.
The ARM7TDMI processor bus interface can perform four different types of bus cycle:
•
•
•
•
memory request signals are broadcast in the bus cycle ahead of the bus cycle to
which they refer
address class signals are broadcast half a clock cycle ahead of the bus cycle to
which they refer.
a nonsequential cycle requests a transfer to or from an address which is unrelated
to the address used in the preceding cycle
a sequential cycle requests a transfer to or from an address which is either the
same, one word, or one halfword greater than the address used in the preceding
cycle
an internal cycle does not require a transfer because it is performing an internal
function, and no useful prefetching can be performed at the same time
a coprocessor register transfer cycle uses the data bus to communicate with a
coprocessor, but does not require any action by the memory system.
Copyright © 1994-2001. All rights reserved.
nMREQ
D[31:0]
A[31:0]
MCLK
SEQ
APE
Figure 3-1 Simple memory cycle
ARM DDI 0029G
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