AT89C5122D-RDTUM datasheet(48/208 Pages) ATMEL

Part #	AT89C5122D-RDTUM

Description	C51 Microcontroller with USB and Smart Card Reader Interfaces

PDF	208 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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48 / 208 page

AT83R5122, AT8xC5122/23

4202F–SCR–07/2008

USB Interface Clock

The USB Interface uses two clocks :

–

The first one is the CPU clock used for the interface with the microcontroller,

CK_IDLE.

–

The second one is the CK_USB supplied from the PLL through a divider by

Registers

Reset Value = XXXX XXX0b

Reset Value = XXXX 1111b

Table 24.

Clock Selection Register - CKSEL (S:85h)

7654

3210

----

---

CKS

Bit Number

Bit Mnemonic Description

7:1

Reserved

The value read from this bit is indeterminate. Do not set this bit.

0CKS

CPU Oscillator Select Bit

Set this bit to connect CPU and Peripherals to PLL output.

Clear this to to connect CPU and Peripherals to XTAL1 clock input.

Table 25.

Clock Reload Register - CKRL (S:97h)

765

43210

CKRL3

CKRL2

CKRL1

CKRL0

Bit Number

Bit Mnemonic Description

7 - 4

Reserved

The value read from this bit is indeterminate. Do not set this bit.

3:0

CKRL3:0

Clock Reload register

Prescaler1 value

Fck_cpu =[ 1 / 2*(16-CKRL)] * Fck_XTAL1

AT89C5122D-RDTUM Datasheet(PDF) 48 Page - ATMEL Corporation

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