AT89C5122D-RDRUM Atmel, AT89C5122D-RDRUM Datasheet - Page 90

• 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

Procedure for CVcc = 5volts
90
AT83R5122, AT8xC5122/23
The DC/DC pump mode must be selected (MODE = 0 in DCCKPS register). The
detailed procedure is described in flow chart of Figure 47.
Figure 47. Card Vcc = 5V Initialization Procedure
While VCC remains higher than 4.0V and startup current lower than 30 mA (depending
on the load type), the DC/DC converter should be ready without having to increment
BOOST[1:0] bits beyond [0:0] level. If VCC > 4.0V and startup current > 30 mA, it will be
necessary to increment the BOOST[1:0] bits until the DC/DC converter is ready.
Incrementation of BOOST[1:0] bits increases at the same time the current overflow level
in the same proportion as the startup current. So once the DC/DC converter is ready it is
SCCON CardVcc=1
Set Timeout to 3 ms
SCICR.7=Reset=1
SCICR.7=Reset=0
BOOST[1:0]=[0:0]
VCARD[1:0] = 11
DCCKPS[7]=0
VCARDOK=1
Mode Pump
BOOST [1:0]
BOOST[1:0]
= max = 3?
Increment
Timeout
Expired
DC/DC Initialization
Failure
DC/DC Initialization
current overflow
BOOST[1:0]
BOOST[1:0]
to adjust the
Decrement
Successful
= [0:0]
4202F–SCR–07/2008