AT89C5122D-PSTUM Atmel, AT89C5122D-PSTUM Datasheet - Page 76

• Manufacturer Part Number: AT89C5122D-PSTUM
• Description: IC 8051 MCU FLASH 32K 64QFN
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C5122D-PSTUM

• 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-QFN
• For Use With: AT89STK-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: -

Alternate Card
Registers
76
AT83R5122, AT8xC5122/23
A second card named ‘Alternate Card’ can be controlled.
The Clock signal CCLK1 can be adapted to the XTAL frequency. Thanks to the clock
prescaler which can divide the frequency by 1, 2, 4 or 8. The bits ALTKPS0 and
ALTKPS1 in SCSR Register are used to set this factor.
Figure 44. Alternate Card
There are fifteen registers to control the SCIB macro-cell. They are described from
Table 58 to Table 45.
Some of the register widths are greater than a byte. Despite the 8 bits access provided
by the BIU, the address mapping of this kind of register respects the following rule :
The Low significant byte register is implemented at the higher address.
This implementation makes access to these registers easier when using high level pro-
gramming languages (C,C++).
CK_IDLE
SCSR Reg.
ALTKPS0,1
PR3
1, 1/2, 1/4 or 1/8
P1.7
SCSR Reg.
SCCLK1
1
0
CVCC
CRST
CIO
CCLK
CPRES
CCLK1
SIM, SAM
SMART
CARD
CARD
4202F–SCR–07/2008
Alternate
Main
card
card