M42800A Atmel Corporation, M42800A Datasheet - Page 121

• 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

17. USART: Universal Synchronous/Asynchronous Receiver/Transmitter
Figure 17-1. USART Block Diagram
1779D–ATARM–14-Apr-06
USxIRQ
MCKI/8
SLCK
MCKI
SCK
ASB
APB
AMBA
The AT91M42800A provides two identical, full-duplex, universal synchronous/asynchronous
receiver/transmitters that interface to the APB and are connected to the Peripheral Data
Controller.
The main features are:
• Programmable Baud Rate Generator with External or Internal Clock, as well as Slow Clock
• Parity, Framing and Overrun Error Detection
• Line Break Generation and Detection
• Automatic Echo, Local Loopback and Remote Loopback channel modes
• Multi-drop Mode: Address Detection and Generation
• Interrupt Generation
• Two Dedicated Peripheral Data Controller channels
• 5-, 6-, 7-, 8- and 9-bit character length
Peripheral Data Controller
Baud Rate Generator
Receiver
Channel
Interrupt Control
Control Logic
Transmitter
Channel
Baud Rate Clock
USART Channel
Transmitter
Receiver
AT91M42800A
Controller
Parallel
PIO:
I/O
RXD
TXD
SCK
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