ELANSC310 datasheet(42/119 Pages) AMD

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Élan™SC310 Microcontroller Data Sheet

PREL IMINARY

management control (PMC) pins that are controlled by

the operating modes.

Clock Generation

The ÉlanSC310 microcontroller requires only one

32.768-kHz clock input that is used to generate all

other clock frequencies required by the system. This

32.768-kHz clock input is provided through the X32IN

and X32OUT pins and the crystal oscillator circuit. This

input frequency is then used to internally drive multiple

Phase-Locked Loops that create all necessary fre-

quencies.

The clock rate that is used to drive the internal CPU is

determined by the mode of operation of the ÉlanSC310

microcontroller.

The clock generation, control, and distribution scheme

are detailed in Figure 1 and Figure 2, which follow.

INT_PLL

LS_PLL

HS_PLL

VID_PLL

32 kHz

Input

LS_PLL_EN

HS_PLL_EN

VID_PLL_EN

1.4746 MHz

18.432 MHz

1.8432 MHz

1.1892 MHz

14.336 MHz

Programmable

2 x CPU Clock

Figure 1.

PLL Block Diagram

÷ 2

36.864 MHz

2.048 MHz

ELANSC310 数据表(PDF) 42 Page - Advanced Micro Devices

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