M42800A Atmel Corporation, M42800A Datasheet - Page 179

• 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. SPI: Serial Peripheral Interface
19.1
1779D–ATARM–14-Apr-06
Pin Description
The AT91M42800A includes two SPIs which provide communication with external devices in
master or slave mode. They are independent, and are referred to by the letters A and B.
Seven pins are associated with the SPI Interface. When not needed for the SPI function, each
of these pins can be configured as a PIO. Support for an external master is provided by the
PIO Controller Multi-driver option. To configure an SPI pin as open-drain to support external
drivers, set the corresponding bits in the PIO_MDSR register (see
An input filter can be enabled on the SPI input pins by setting the corresponding bits in the
PIO_IFSR (see
put or slave select input. Refer to
Figure 19-1. SPI Block Diagram
APB
MCK
MCK/32
page
108). The NPCS0/NSS pin can function as a peripheral chip select out-
Serial Peripheral Interface
Interrupt Controller
Table 19-1 on page 180
Advanced
INT
NPCS0/NSS
NPCS1
NPCS2
NPCS3
SPCK
MISO
MOSI
for a description of the SPI pins.
Parallel IO
Controller
AT91M42800A
page
114).
Generic Name
NPCS0/NSS
NPCS1
NPCS2
NPCS3
SPCK
MOSI
MISO
179