AT89C5122D-RDRIM Atmel, AT89C5122D-RDRIM Datasheet - Page 170
![IC MCU 80C51 W/SMART CARD 64VQFP](/photos/6/81/68127/313-64-vqfp_sml.jpg)
AT89C5122D-RDRIM
Manufacturer Part Number
AT89C5122D-RDRIM
Description
IC MCU 80C51 W/SMART CARD 64VQFP
Manufacturer
Atmel
Series
89Cr
Specifications of AT89C5122D-RDRIM
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
AT89STK-10 - KIT EVAL APPL MASS STORAGEAT89STK-03 - KIT STARTER FOR MCU AT8XC5122/23
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Other names
AT89C5122DRDRIMTR
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Microcontroller Reset
Introduction
170
AT83R5122, AT8xC5122/23
The internal reset is used to start up (cold reset) or to re-start (warm reset) the micro-
controller activity. When the reset is applied (active state), all internal registers are
initialized so that the microcontroller starts from a known and clean state for the program
always runs as expected.
The reset is released (inactive state) when the following conditions are internally met :
If one of the above conditions is not met the microcontroller is not correctly reset and
might not work properly.
The internal reset comes from four different sources :
Figure 100. Reset bock diagram
RST
Vcc
–
–
–
–
–
–
–
The power supply has reatched a minimum level which garantees that the
microcontroller works properly
The on-chip oscillator has reached a minimum oscillation level which
ensures a good noise to signal ratio and a correct internal duty cycle
the active state duration is at least two machine cycles.
Reset pin
Power On Reset (POR)
Power Fail Detector (PFD)
Hardware Watch-Dog Timer (WDT)
3.3V Internal
Digital Regulator
POR
Watch Dog
Timer
PFD
Core
C51
Microcontroller
4202F–SCR–07/2008
Internal Reset
VCore
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