M55800A Atmel Corporation, M55800A Datasheet - Page 24
M55800A
Manufacturer Part Number
M55800A
Description
Manufacturer
Atmel Corporation
Datasheets
1.M40800.pdf
(284 pages)
2.M40800.pdf
(153 pages)
3.M55800A.pdf
(29 pages)
4.M55800A.pdf
(256 pages)
5.M55800A.pdf
(28 pages)
Specifications of M55800A
Flash (kbytes)
0 Kbytes
Pin Count
176
Max. Operating Frequency
33 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
58
Ext Interrupts
58
Usb Speed
No
Usb Interface
No
Spi
1
Uart
3
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
72
Resistive Touch Screen
No
Dac Channels
1
Dac Resolution (bits)
10
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
8
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
3.3/5.0
Fpu
No
Mpu / Mmu
no / no
Timers
6
Output Compare Channels
6
Input Capture Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
No
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Byte Write or Byte Select
Access
24
AT91X40 Series
Each chip select with a 16-bit data bus can operate with one of two different types of
write access:
•
•
This option is controlled by the BAT field in the EBI_CSR (Chip Select Register) for the
corresponding chip select.
Byte Write Access is used to connect 2 x 8-bit devices as a 16-bit memory page.
•
•
•
•
Figure 11 shows how to connect two 512K x 8-bit devices in parallel on NCS2.
Figure 11. Memory Connection for 2 x 8-bit Data Busses
Byte Write Access supports two byte write and a single read signal.
Byte Select Access selects upper and/or lower byte with two byte select lines, and
separate read and write signals.
The signal A0/NLB is not used.
The signal NWR1/NUB is used as NWR1 and enables upper byte writes.
The signal NWR0/NWE is used as NWR0 and enables lower byte writes.
The signal NRD/NOE is used as NRD and enables half-word and byte reads.
EBI
D8 - D15
A1 - A19
D0 - D7
NWR1
NWR0
NCS2
NRD
A0
D0 - D7
A0 - A18
Write Enable
Read Enable
Memory Enable
D8 - D15
A0 - A18
Write Enable
Read Enable
Memory Enable
1354D–ATARM–08/02
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