AT83C24 ATMEL Corporation, AT83C24 Datasheet - Page 12

• Manufacturer Part Number: AT83C24
• Description: Smart Card Reader Interface with Power Management
• Manufacturer: ATMEL Corporation

CRST Controller
12
AT83C24
The CRST output pin is driven by the A1/RST pin signal pin or by the CARDRST bit
value. This selection depends of the CRST_SEL bit value (see CONFIG4 register).
If the CRST pin signal is driven by the CARDRST bit value, two modes are available:
•
•
Figure 6. Clock Block Diagram with Software Activation (see page 14)
Figure 7. Clock Block Diagram with Hardware Activation (see page 14)
CMDVCC
A1/RST
If the ART bit is reset, CRST pin is driven by CARDRST bit.
If the ART bit is set, CRST pin is controlled and follows the “Automatic Reset
Transition” (page 15).
A2/CK
A2/CK
CLK
CLK
CRST_SEL bit
DCK[2:0]
DCK[2:0]
CKS[2:0]
CKS[2:0]
Hardware
activation
DCCLK
DCCLK
CARDCK bit
CARDCK bit
CKSTOP bit
CKSTOP bit
DC/DC
DC/DC
1
1
0
0
CCLK
CCLK
4234E–SCR–09/04