AT89EVK-01 Atmel, AT89EVK-01 Datasheet - Page 4

• Manufacturer Part Number: AT89EVK-01
• Description: KIT EVAL FOR AT83C24 FOR TDA8004
• Manufacturer: Atmel

Specifications of AT89EVK-01

• Main Purpose: Memory, Smart Card
• Utilized Ic / Part: AT83C24
• Processor To Be Evaluated: AT83C24
• Interface Type: RS-232
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4325C–SCR–09/04
Hardware Description
2.1.3
2.1.4
2.1.5
2-6
Smart Card Clock
Signal (CCLK)
Power Supply
PRES, PRES\
Two solutions are proposed for the clock generation: waveform generator or crystal.
Figure 2-2. External Waveform Generator for Clock
Figure 2-3. Crystal for Clock
A solder pad (SW4) is used to configure the source: crystal or external waveform
generator.
Table 2-1. Clock Solder Pads Configuration
The AT83C24 outputs the smart card clock signal (CCLK). Two modes are available to
generate this signal:
1. The source is CLK. The CKS prescaler is used to divide CLK signal or DCCLK
2. The source is A2. The CKS prescaler is used to divide A2 signal.
The power supply comes from the TDA8004 footprint. The signal VDDP of the TDA8004
is used (5V).
The EVCC pin of the AT83C24 is connected to the VDD (3.3V). EVCC is used to supply
the AT83C24 pads connected to the customer application.
The TWI_SEL switch is connected on an I/O of the T89C5121. The TDA8004
(TDA8024) PRES pin and PRES\ pin are connected on T89C5121 I/Os. The position of
signal.
waveform
generator
without solder
with solder
SW4
14.74MHz
XTAL1
XTAL1
AT83C24
AT83C24
AT89C5121
AT89C5121
AT83C24 2.0.0
ATMEL
VSS
AT83C24 2.0.0
ATMEL
VCC
VSS
VCC
SO plug
SO plug
Waveform generator
Configuration
RESET
RESET
crystal
AT89EVK-01 User Guide
Tx
Rx
SDA
SCL
Tx
Rx
SCL
SDA