AT89C5122D-RDRUM Atmel, AT89C5122D-RDRUM Datasheet - Page 49

• 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

4202F–SCR–07/2008
Table 26. Clock Configuration Register 0 - CKCON0 (S:8Fh)
Reset Value = X0X0 X000b
Bit Number Bit Mnemonic Description
7
-
7
6
5
4
3
2
1
0
WDX2
6
WDX2
T1X2
T0X2
SIX2
X2
-
-
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Watchdog clock
This control bit is validated when the CPU clock X2 is set; when X2 is low,
this bit has no effect.
Cleared to bypass the 1/2 prescaler.
Set to select the 1/2 output for this peripheral.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Enhanced UART clock (Mode 0 and 2)
This control bit is validated when the CPU clock X2 is set; when X2 is low,
this bit has no effect.
Cleared to bypass the 1/2 prescaler.
Set to select the 1/2 output for this peripheral.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Timer 1 clock
This control bit is validated when the CPU clock X2 is set; when X2 is low,
this bit has no effect.
Cleared to bypass the 1/2 prescaler.
Set to select the 1/2 output for this peripheral.
Timer 0 clock
This control bit is validated when the CPU clock X2 is set; when X2 is low,
this bit has no effect.
Cleared to bypass the 1/2 prescaler.
Set to select the 1/2 output for this peripheral.
System clock Control bit
Cleared to select the PRT output for CPU and all the peripherals .
Set to bypass the PRT prescaler and to enable the individual peripherals ‘X2’
bits.
5
-
AT83R5122, AT8xC5122/23
SIX2
4
3
-
T1X2
2
T0X2
1
X2
0
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