M55800A Atmel Corporation, M55800A Datasheet - Page 99

• Manufacturer Part Number: M55800A
• Manufacturer: Atmel Corporation

Specifications of M55800A

• Flash (kbytes): 0 Kbytes
• Pin Count: 176
• Max. Operating Frequency: 33 MHz
• Cpu: ARM7TDMI
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 58
• Ext Interrupts: 58
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Uart: 3
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 72
• Resistive Touch Screen: No
• Dac Channels: 1
• Dac Resolution (bits): 10
• 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

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