R40008 Atmel Corporation, R40008 Datasheet - Page 25

• 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

1354D–ATARM–08/02
Byte Select Access is used to connect 16-bit devices in a memory page.
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Figure 12 shows how to connect a 16-bit device with byte and half-word access (e.g. 16-
bit SRAM) on NCS2.
Figure 12. Connection for a 16-bit Data Bus with Byte and Half-word Access
Figure 13 shows how to connect a 16-bit device without byte access (e.g. Flash) on
NCS2.
Figure 13. Connection for a 16-bit Data Bus without Byte Write Capability.
The signal A0/NLB is used as NLB and enables the lower byte for both read and
write operations.
The signal NWR1/NUB is used as NUB and enables the upper byte for both read
and write operations.
The signal NWR0/NWE is used as NWE and enables writing for byte or half word.
The signal NRD/NOE is used as NOE and enables reading for byte or half word.
EBI
EBI
D8 - D15
A1 - A19
D8 - D15
A1 - A19
D0 - D7
D0 - D7
NCS2
NWE
NCS2
NOE
NUB
NLB
NWE
NOE
NUB
NLB
D0 - D7
D8 - D15
A0 - A18
Write Enable
Output Enable
Memory Enable
D0 - D7
D8 - D15
A0 - A18
Low Byte Enable
High Byte Enable
Write Enable
Output Enable
Memory Enable
AT91X40 Series
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