AT89C5122D-RDRUM Atmel, AT89C5122D-RDRUM Datasheet - Page 173

• Manufacturer Part Number: AT89C5122D-RDRUM
• Description: IC 8051 MCU 32K CRAM USB 64-VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C5122D-RDRUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 48MHz
• Connectivity: SmartCard, SPI, UART/USART, USB
• Peripherals: LED, POR, WDT
• Number Of I /o: 46
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• For Use With: AT89OCD-01 - USB EMULATOR FOR AT8XC51 MCUAT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-03 - KIT STARTER FOR MCU AT8XC5122/23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Other names: AT89C5122D-RDRUMTR

Reset pin
Long Reset
Reset Controlled by the User
4202F–SCR–07/2008
As explained in the POR section there is no need to use the reset pin as the internal
reset function at power up is ensured by the POR. Anyway, if some applications
requires a long reset, a reset controlled by the user or a reset controlled by external
superviser device, the use of the reset pin is necessary.
As the pad integrates an internal pull-up of 10K, only an external capacitor of at least 10
μF is required to have an impact on the reset duration.
Figure 103. Long Reset
The external capacitor is not needed if no long reset is required.
Figure 104. Reset Controlled by the User
10 μF
RST
RST
Vcc
Vcc
10 K
10 K
AT83R5122, AT8xC5122/23
Microcontrolleur
Microcontrolleur
Internal Reset
Internal Reset
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