AT89C5122D-PSTUM Atmel, AT89C5122D-PSTUM Datasheet - Page 171
AT89C5122D-PSTUM
Manufacturer Part Number
AT89C5122D-PSTUM
Description
IC 8051 MCU FLASH 32K 64QFN
Manufacturer
Atmel
Series
89Cr
Datasheet
1.AT89C5122D-PSTUM.pdf
(208 pages)
Specifications of AT89C5122D-PSTUM
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-QFN
For Use With
AT89STK-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
-
- Current page: 171 of 208
- Download datasheet (3Mb)
Power On Reset (POR)
Power Fail Detector
(PFD)
4202F–SCR–07/2008
The role of the POR is to monitor the power supply rise of the microcontroller core and
release the internal reset only when the internal voltage exceeds the VPFDP threshold
from which the microcontroller core is stable (see Figure 101). This feature replaces the
external reset function and therefore avoid the use of external components on the reset
pin.
The role of the PFD is to monitor the power supply falls during a steady state condition
in order to suspend the microcontroller and peripherals activity as soon as the power
supply drops below the VPFDM threshold from which the microcontroller’s core might
become instable (see Figure 101). The PDF suspends the microcontroller’s activity by
holding the microcontroller under a reset state to avoid an unpredictable behaviour.
A filter prevents the system from reseting when glitches lower than 50 ns duration are
carried on Vcore. See Figure 101 and Figure 102 on page 172.
AT83R5122, AT8xC5122/23
171
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