AT83EC5123 ATMEL Corporation, AT83EC5123 Datasheet - Page 33

• Manufacturer Part Number: AT83EC5123
• Description: (AT8xx512x) Smart Card Reader ICs
• Manufacturer: ATMEL Corporation

Figure 15. PLL Block Diagram and Symbol
PLL Programming
4202B–SCR–07/03
CK_XTAL1
N Divider
N3:0
Figure 16. PLL Filter Connection
The PLL is programmed V
eration is enabled, user must wait until the lock indicator is set to ensure the clock output
is stable.
Figure 17. PLL Programming Flow
PLLCON.1
PLLCON.0
PLOCK
PLLEN
PFLD
Down
Up
REF
PLLF
R divider
using the flow showed in Figure 17. As soon as clock gen-
R3:0
PLLF
CHP
Configure Dividers
Programming
PLL Locked?
N3:0=
R3:0=
Enable PLL
PLOCK= 1?
PLLEN= 1
V
PLL
VSS
REF
xxxxb
xxxxb
VCO
VSS
AT8xC5122/23
CK_PLL
33