T89C5121-ICUIL Atmel, T89C5121-ICUIL Datasheet - Page 22

• Manufacturer Part Number: T89C5121-ICUIL
• Description: IC 8051 MCU W/SMART CARD 24SSOP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of T89C5121-ICUIL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SmartCard, UART/USART
• Peripherals: LED, POR, WDT
• Number Of I /o: 14
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: Flash RAM
• Eeprom Size: 16K x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.85 V ~ 5.4 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 24-SSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Other names: Q1468934; T89C5121-ICSIL; T89C5121-ICSIL

Clock Management
Functional Block
Diagram
22
A/T8xC5121
In order to optimize the power consumption and the execution time needed for a specific
task, an internal prescaler feature and a X2 feature have been implemented between
the oscillator and the CPU.
Figure 11. Clock Generation Diagram
If CKRL<>7 then:
If CKRL = 7 then:
XTAL1
XTAL2
F
CLK CPU
F
CLK CPU
–
–
Osc.
=
=
F
Fosc
------------- -
2 x2
OSC
F O SC
-----------------
2 x2
CKRL
7
6
5
4
3
2
1
0
x
---------------------------------- -
2 7 CKRL
2
1
–
1
CKCON0
X2
0
1
F
2
OSC
x2
2(7-CKRL)
1
Prescalor Factor
CKRL = 7
CKRL
0
1
10
12
14
1
2
4
6
8
4164G–SCR–07/06
F
F
CLK_CPU
CLK_Periph