AT89C5122D-RDRUM Atmel, AT89C5122D-RDRUM Datasheet - Page 46

• 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

SCIB Clock
46
AT83R5122, AT8xC5122/23
The Smart Card Interface Block (SCIB) uses two clocks :
During SCIB Reset, the CK_ISO input must be in the range 1 - 5 MHz according to ISO
7816. The SCIB clocks frequency is defined in Figure 41 on page 72 and Table 42 on
page 72.
Two conditions must be met for a correct use of the SCIB:
•
•
–
–
CK_CPU > 4/3 * CK_ISO and
CK_CPU < 6 * CK_ISO.
External Clock
External Clock
48 MHz
24 MHz
The first one, CK_IDLE, is the peripheral clock used for the interface with the
microcontroller.
The second one, CK_ISO, is independant from the CPU clock and is
generated from the PLL or XTAL1 output.
PR2, a 6-bit prescaler, will be used to generate:
12/9.6/8/6.85/6/5.33/4.8/4.36/ ..../1MHz frequencies.
SCIB clock frequency must be lower than CPU clock frequency.
96 MHz
PLL
X1 mode selected
X2 mode selected
Prescaler
1/4
1/2
(Equivalent to)
(Equivalent to)
PERIPH frequency
PERIPH frequency
PERIPH frequency
CPU frequency
CPU frequency
CPU frequency
24 MHz
24 MHz
24 MHz
24 MHz
24 MHz
24 MHz
4202F–SCR–07/2008