T89C5121-ICUIL Atmel, T89C5121-ICUIL Datasheet - Page 24
T89C5121-ICUIL
Manufacturer Part Number
T89C5121-ICUIL
Description
IC 8051 MCU W/SMART CARD 24SSOP
Manufacturer
Atmel
Series
89Cr
Datasheet
1.89C5121-SK1.pdf
(115 pages)
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
T89C5121-ICSIL
T89C5121-ICSIL
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Clock Prescaler
Clock Control Registers
Clock Prescaler Register
24
A/T8xC5121
Before supplying the CPU and the peripherals, the main clock is divided by a factor 2 to
30 to reduce the CPU power consumption. This factor is controlled with the CKRL
register.
Table 7. Examples of Factors
This register is used to reload the clock prescaler of the CPU and peripheral clock.
Table 8. CKRL Register
CKRL - Clock Reload Register (97h)
Reset Value = XXXX 111Xb
XTAL (MHz)
Number
7 - 4
3 - 1
Bit
7
-
0
16
16
16
16
16
16
Mnemonic
X2 CPU CKCON0
CKRL
6
-
Bit
0 (reset mode)
1 (X2 mode)
-
-
1
0
0
1
Description
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Clock Reload Register
Prescaler value
XXXX 000Xb: CKRL=7 and Division factor equals 14
XXXX 110Xb: CKRL=6 and factor equals 2
XXXX 111Xb: CKRL=7 and division factor equals 1
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
CKRL Value
4
-
07h
07h
07h
07h
06h
06h
CKRL
3
Prescaler Factor
CKRL
1
1
1
1
2
2
2
CKRL
F
1
CLK_CPU,
4164G–SCR–07/06
(MHz)
16
16
F
8
8
4
8
CLK_Periph
0
-
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