M42800A Atmel Corporation, M42800A Datasheet - Page 99
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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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USART: Universal
Synchronous/
Asynchronous
Receiver/
Transmitter
Figure 36. USART Block Diagram
Pin Description
Each USART channel has the following external signals:
Notes:
1354D–ATARM–08/02
Name
RXD
SCK
TXD
1. After a hardware reset, the USART pins are not enabled by default (see “PIO: Parallel I/O Controller” on page 74). The user
2. If the user selects one of the internal clocks, SCK can be configured as a PIO.
USxIRQ
must configure the PIO Controller before enabling the transmitter or receiver.
MCK/8
Description
USART Serial clock can be configured as input or output:
SCK is configured as input if an External clock is selected (USCLKS[1] = 1)
SCK is driven as output if the External Clock is disabled (USCLKS[1] = 0) and Clock output is enabled (CLKO = 1)
Transmit Serial Data is an output
Receive Serial Data is an input
MCK
ASB
APB
AMBA
The AT91X40 Series provides two identical, full-duplex, universal synchronous/asyn-
chronous receiver/transmitters that interface to the APB and are connected to the
Peripheral Data Controller.
The main features are:
•
•
•
•
•
•
•
•
Peripheral Data Controller
Baud Rate Generator
Receiver
Channel
Programmable Baud Rate Generator
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
Interrupt Control
Control Logic
Transmitter
Channel
Baud Rate Clock
USART Channel
Transmitter
Receiver
AT91X40 Series
Controller
Parallel
PIO:
I/O
RXD
TXD
SCK
99
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