R40008 Atmel Corporation, R40008 Datasheet - Page 147
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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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6.3
ARM DDI 0029G
Thumb branch with link
A Thumb Branch with Link operation consists of two consecutive Thumb instructions.
Refer to the ARM Architecture Reference Manual for more information.
The first instruction acts like a simple data operation to add the PC to the upper part of
the offset, storing the result in Register 14, LR.
The second instruction which takes a single cycle acts in a similar fashion to the ARM
state branch with link instruction. The first cycle therefore calculates the final branch
destination whilst performing a prefetch from the current PC.
The second cycle of the second instruction performs a fetch from the branch destination
and the return address is stored in R14.
The third cycle of the second instruction performs a fetch from the destination +2,
refilling the instruction pipeline and R14 is modified, with 2 subtracted from it, to
simplify the return to
subroutine work correctly.
The cycle timings of the complete operation are listed in Table 6-2 where:
•
pc is the address of the first instruction of the operation.
Cycle
1
2
3
4
Copyright © 1994-2001. All rights reserved.
Address
pc+4
pc+6
alu
alu+2
alu+4
MAS[1:0]
1
1
1
1
. This makes the
nRW
0
0
0
0
Table 6-2 Thumb long branch with link
Data
(pc+4)
(pc+6)
(alu)
(alu+2)
nMREQ
0
0
0
0
Instruction Cycle Timings
SEQ
1
0
1
1
nOPC
0
0
0
0
type of
6-5
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