R40008 Atmel Corporation, R40008 Datasheet - Page 246

• Manufacturer Part Number: R40008
• Manufacturer: Atmel Corporation

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

Debug in Depth
B-28
DBGACK
nMREQ
SEQ
D[31:0]
A[31:0]
CLK
You can see from Figure 5-3 on page 5-7 that the final memory access occurs in the
cycle after DBGACK goes HIGH, this is the point at which the cycle counter must be
disabled. Figure B-6 shows that the first memory access that the cycle counter has not
seen before occurs in the cycle after DBGACK goes LOW and so this is when the
counter must be re-enabled.
When a system speed access from debug state occurs, the core temporarily drops out of
debug state and so DBGACK can go LOW. If there are peripherals that are sensitive to
the number of memory accesses, they must be led to believe that the core is still in debug
state. By programming the EmbeddedICE macrocell control register, the value on
DBGACK can be forced to be HIGH.
Internal cycles
Note
Copyright © 1994-2001. All rights reserved.
N
Ab
S
Ab+4 Ab+8
Figure B-6 Debug exit sequence
S
ARM DDI 0029G