R40008 Atmel Corporation, R40008 Datasheet - Page 87

• 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

3.6
3.6.1
ARM DDI 0029G
Data timed signals
D[31:0], DOUT[31:0], and DIN[31:0]
This section describes:
•
•
•
•
The ARM7TDMI processor provides both unidirectional data buses, DIN[31:0],
DOUT[31:0], and a bidirectional data bus, D[31:0]. The configuration input BUSEN is
used to select which is active. Figure 3-11 shows the arrangement of the data buses and
bus-splitter logic.
When the bidirectional data bus is being used then you must disable the unidirectional
buses by driving BUSEN LOW. The timing of the bus for three cycles, load-store-load,
is shown in Figure 3-12 on page 3-18.
D[31:0], DOUT[31:0], and DIN[31:0] on page 3-17
ABORT on page 3-24
Byte latch enables on page 3-24
Byte and halfword accesses on page 3-26.
Copyright © 1994-2001. All rights reserved.
ARM7TDMI
Latch control
EmbeddICE
Buffer control
Logic
Figure 3-11 External bus arrangement
Latch
G
Memory Interface
DIN[31:0]
DOUT[31:0]
D[31:0]
3-17