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PIC18F2450/4450

Clarifications/Corrections to the Data

Sheet:

In the Device Data Sheet (DS39760A), the following

clarifications and corrections should be noted. Any

silicon issues related to the PIC18F2450/4450 will be

reported in a separate silicon errata. Please check the

Microchip web site for any existing issues.

1. Module: USB

The USB module for this device incorporates con-

figurable, internal pull-up resistors on the D+ and

D- lines. The description and explanation of the

pull-ups, however, have been largely omitted from

the data sheet.

The following additions are made to Section 14.0

“Universal Serial Bus (USB)”:

1. Figure 14-1 is amended to show the internal

pull-ups and their control (added detail in dark

line, added text in bold), as shown below.

2. In Section 14.2.2.1 “Internal Transceiver”,

the following paragraph is added immediately

following the first paragraph:

The on-chip USB pull-up resistors are

controlled by the UPUEN bit (UCFG<4>). They

can only be selected when the on-chip

transceiver is enabled.

3. A new section is added, following the existing

Section 14.2.2.2 “External Transceiver”. It

reads in its entirety as follows:

14.2.2.3 Internal Pull-up Resistors

The PIC18F2450/4450 devices have built-in

pull-up resistors designed to meet the require-

ments for low-speed and full-speed USB. The

UPUEN bit (UCFG<4>) enables the internal

pull-ups. Figure 14-1 shows the pull-ups and

their control.

The existing subsections 14.2.2.3 and follow-

ing are renumbered appropriately, starting with

Section 14.2.2.3 “Pull-up Resistors” (now

Section 14.2.2.4).

FIGURE 14-1: USB PERIPHERAL AND OPTIONS (PARTIAL REPRESENTATION)

Note: Only the upper half of the figure is repro-

duced for clarity in showing the changes.

There are no modifications to the RAM,

USB SIE or figure footnotes from the

original.

USB

SIE

USB Control

Transceiver

3.3V Regulator

D+

D-

Internal Pull-ups

VUSB

External 3.3V

Supply

(3)

FSEN

UPUEN

UTRDIS

USB Clock from the

Oscillator Module

and

VREGEN

Optional

External

Pull-ups

(2)

(Low

(Full

PIC18F2450/4450 Family

USB Bus

Speed)

Configuration

PIC18F2450/4450 Data Sheet Errata

Summary of content (8 pages)

PAGE 1
PIC18F2450/4450 PIC18F2450/4450 Data Sheet Errata Clarifications/Corrections to the Data Sheet: 2. In Section 14.2.2.1 “Internal Transceiver”, the following paragraph is added immediately following the first paragraph: In the Device Data Sheet (DS39760A), the following clarifications and corrections should be noted. Any silicon issues related to the PIC18F2450/4450 will be reported in a separate silicon errata. Please check the Microchip web site for any existing issues.
PAGE 2
PIC18F2450/4450 2. Module: USB 3. Module: USB In Section 14.4.3 “BD Address Validation”, the USB RAM address range described in the first paragraph is 400h to 7FFh. The correct range is 400h to 4FFh. REGISTER 14-5: bit 3 In Register 14-5 (BDnSTAT, CPU Mode), the operation of the DSTEN bit is clarified with additional text, shown below in bold.
PAGE 3
PIC18F2450/4450 5. Module: Electrical Characteristics 7. Module: Electrical Characteristics In Section 21.3 “DC Characteristics”, the parameters D031 (VIL) and D041 (VIH) are not valid and are deleted from the table. In Section 21.4 “AC (Timing) Characteristics”, Table 21-6 has been updated to reflect the correct range of XT and HSPLL mode operation. The changes are shown below in bold text. 6. Module: Electrical Characteristics In Section 21.
PAGE 4
PIC18F2450/4450 8. Module: ADC In Section 16.2 “Selecting and Configuring Acquisition Time”, Table 16-1 has been updated to reflect the correct device operating frequencies. The changes are shown in bold text. TABLE 21-7: TAD vs. DEVICE OPERATING FREQUENCIES AD Clock Source (TAD) 4: PIC18LFXXXX(4) Operation ADCS2:ADCS0 PIC18FXXXX 2 TOSC 000 2.86 MHz 1.43 MHz 4 TOSC 100 5.71 MHz 2.86 MHz 8 TOSC 001 11.43 MHz 5.72 MHz 16 TOSC 101 22.86 MHz 11.43 MHz 32 TOSC 010 45.71 MHz 22.
PAGE 5
PIC18F2450/4450 REVISION HISTORY Rev A Document (05/2006) Original version of this document. Includes clarification issues 1-4 (USB), 5-7 (Electrical Specifications), 8 (ADC) and 9-10 (USB). © 2006 Microchip Technology Inc.
PAGE 7
Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
PAGE 8
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