M42800A Atmel Corporation, M42800A Datasheet - Page 184

• Manufacturer Part Number: M42800A
• Manufacturer: Atmel Corporation

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

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