89C5121-SK1 Atmel, 89C5121-SK1 Datasheet - Page 27
![no-image](/images/manufacturer_photos/0/0/78/atmel_sml.jpg)
89C5121-SK1
Manufacturer Part Number
89C5121-SK1
Description
KIT SMART CARD FOR AT89C5121
Manufacturer
Atmel
Type
Smart Cardr
Datasheet
1.89C5121-SK1.pdf
(115 pages)
Specifications of 89C5121-SK1
Contents
Board
For Use With/related Products
AT89C5121
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
T89C5121-SK1
T89C5121-SK1
T89C5121-SK1
- Current page: 27 of 115
- Download datasheet (838Kb)
DC/DC Clock
Clock Control Register
Clock Prescaler
4164G–SCR–07/06
The DC/DC block needs a clock with a 50% duty cycle. The frequency must also respect
a value between 3.68 MHz and 4 MHz. The first requirement imposes a divider in the
clock path and the second constraint is solved with the use of a prescaler.
Figure 13. Functional Block Diagram
This register is used to reload the clock prescaler of the DC/DC converter clock.
Table 11. DCCKPS Register
DCCKPS - DC/DC converter Reload Register (BFh)
Reset Value = XXXX XX11b
Before supplying the DC/DC block, the oscillator clock is divided by a factor 2 to 5 to
adapt the clock needed by the DC/DC converter. This factor is controlled with the
DCCKPS register.
The prescaler factor must be chosen to match the requirement range which is 4MHz.
Table 12. Examples of Factors
Number
Bit
7:2
1:0
XTAL (MHz)
7
-
14.756
12
16
20
8
Mnemonic
DCCKPS
Bit
-
6
-
F
OSC
Description
Reserved
Do not use write those bits
Clock Reload Register
Prescaler value
00b: Division factor equals 2
01b: division factor equals 3
10b: division factor equals 4
11b: division factor equals 5 (reset value which minimize the consumption)
DCCKPS Value
5
-
00h
01h
02h
02h
03h
(2 to 5)
DCCKPS
Address BFh
1
4
-
Prescaler
Factor
2
3
4
4
5
3
-
F
2 to 5
OSC
2
-
DC/DC Converter CLK (MHz)
A/T8xC5121
F
CLK_DC/DC
DCCKPS
1
3.689
4
4
4
4
DCCKPS
0
27
Related parts for 89C5121-SK1
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![ATSTK600](/photos/9/20/92038/atstk600_tmb.jpg)
Part Number:
Description:
DEV KIT FOR AVR/AVR32
Manufacturer:
Atmel
Datasheet:
![U641B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
![U4082B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
![U4089B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
![U4255BM-M](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
![U4089B-P](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
![TDA4470](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet:
![ATF22V10B-25PC](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
High-performance EE PLD
Manufacturer:
ATMEL Corporation
Datasheet:
![AT89C51ED2-IM](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
8-bit Flash Microcontroller
Manufacturer:
ATMEL Corporation
Datasheet:
![AT24C01](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
2-Wire Serial EEPROM
Manufacturer:
ATMEL Corporation
Datasheet: