AT85C5122D-RDTUM datasheet(41/208 Pages) ATMEL

No de pièce	AT85C5122D-RDTUM

Description	C51 Microcontroller with USB and Smart Card Reader Interfaces

PDF	208 Pages

Scroll/Zoom	100%

Fabricant	ATMEL [ATMEL Corporation]

Site Internet	http://www.atmel.com

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41 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

Figure 18.

PLL Programming Flow

Clock Tree Architecture

The clock controller outputs several different clocks as shown in Figure 19:

•

a clock for the CPU core

•

a clock for the peripherals which is used to generate the timers, watchdog, SPI,

UART, and ports sampling clocks. This divided clock will be used to generate the

alternate card clock.

•

a clock for the USB

•

a clock for the SCIB controller

•

a clock for the DC/DC converter

These clocks are enabled or not depending on the power reduction mode as detailed in

Section “Power Management”, page 178.

These clocks are generated using four presacalers defined in the table below:

PLL

Programming

Configure Dividers

N3:0=

xxxxb

R3:0=

xxxxb

Enable PLL

PLLEN= 1

PLL Locked?

PLOCK= 1?

Prescaler

Reload Factor

Function

PR1

CKRL

CKRL[0:3]

CPU & Peripheral clocks

PR2

SCICLK

SCICLK[0:5]

Smart card

PR3

SCSR

ALTKPS[0:1]

Alternate card

PR4

DCCKPS

DCCKPS[3:0]

DC/DC

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