AT89C5122D-RDRUM Atmel, AT89C5122D-RDRUM Datasheet - Page 87

• 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

Initialization Procedure
Procedure for CVcc =< 3 volts
4202F–SCR–07/2008
mode by 20% by means of bit OVFADJ in DCCKPS register. When the current overflow
controller is operating, the ICARDOVF is set by the hardware in SCISR register.
The current drawn from power supply by the DC/DC converter is controlled during the
startup phase in order to avoid high transient current mainly in Pump Mode which could
cause the power supply voltage to drop dramatically. This control is done by means of
bits BOOST[1:0], which increases progressively the startup current level.
The initialization procedure is different depending upon the required Card Vcc. One pro-
cedure apply for Card Vcc =< 3 volts and one procedure for Card Vcc = 5 volts.
The initialization procedure involves :
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The DC/DC regulation mode must be selected for Card Vcc = 1.8 volts and Card Vcc =
3 volts (MODE = 1 in DCCKPS register) The detailed procedures is described in flow
chart of Figure 45. for Card Vcc = 1.8 volts and in the flow chart of Figure 46. for Card
Vcc = 3 volts
Select the CVCC level by means of bits VCARD[1:0] in SCICR register,
Set bits BOOST[1:0] in DCCKPS register following the current level control wanted.
Switch the DC/DC on by means of bit CARDVCC in SCCON register,
Monitor bit VCARDOK in SCISR register in order to know when the DC/DC
Converter is ready (CVCC voltage has reached the expected level)
AT83R5122, AT8xC5122/23
87