32.768 kHz
32.768 kHz
Enable
32.768 kHz
Oscillator
RTC
DRAM
Controller
and PMU
1.4746 MHz
36.864 MHz
Intermediate PLL
Low-Speed PLL
Enable
PMU
Enable
Enable
20.736 MHz–
36.864 MHz
Graphics Dot
Clock PLL
Graphics
Controller
Dot Clock
High-Speed PLL
66.3552 MHz
18.432 MHz
1.8432 MHz
/2
Graphics Dot
Clock Select
UART
/20
PLL Block
CLK_IO
CLK_IO Select
1.1892 MHz
/31
Timer
CLK_IO
1.19318 MHz
36.864 MHz
66.3552 MHz
33.1776 MHz
DRAM and
Graphics
Controllers
/2
/4
/8
16.5888 MHz
8.2944 MHz
4.1472 MHz
CPU and
VL-Bus
Controller
ISA Bus, ROM,
and PC Card
Controllers
/16
2.0736 MHz
1.0368 MHz
/32
/64
DMA
Controller
DRAM Clock Select
CPU Clock Select
ISA Bus Clock Select
DMA Clock Select
Notes:
The graphics controller and the PC Card controller are not supported on the ÉlanSC410 microcontroller.
Figure 5. Clock Source Block Diagram
78
Élan™SC400 and ÉlanSC410 Microcontrollers Data Sheet
AMD [ AMD ]
