M42800A Atmel Corporation, M42800A Datasheet - Page 184
M42800A
Manufacturer Part Number
M42800A
Description
Manufacturer
Atmel Corporation
Datasheets
1.M40800.pdf
(284 pages)
2.M40800.pdf
(153 pages)
3.M42800A.pdf
(224 pages)
4.M42800A.pdf
(27 pages)
Specifications of M42800A
Flash (kbytes)
0 Kbytes
Pin Count
144
Max. Operating Frequency
33 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
54
Ext Interrupts
54
Usb Speed
No
Usb Interface
No
Spi
2
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Resistive Touch Screen
No
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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19.3
Figure 19-4. SPI in Slave Mode
184
Slave Mode
AT91M42800A
SPCK
SPIDIS
NSS
MOSI
SPIEN
In Slave Mode, the SPI waits for NSS to go active low before receiving the serial clock from an
external master.
In slave mode CPOL, NCPHA and BITS fields of SP_CSR0 are used to define the transfer
characteristics. The other Chip Select Registers are not used in slave mode.
S
R
Q
LSB
SP_RDR
SP_TDR
Serializer
RD
TD
MSB
SP_IMR
SP_IDR
SP_IER
SP_SR
S
P
E
N
S
I
T
D
R
E
R
D
R
F
O
R
V
E
SPIRQ
MISO
1779D–ATARM–14-Apr-06
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