PIC16C745 Datasheet

IC型号：
PIC16C745
PDF描述：
8-Bit CMOS Microcontrollers with USB
文件大小：
4945.69KB
PDF页数：
165页
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PIC16C745/765

1B5h))

U-X

鈥?/div>

bit7

U-X

鈥?/div>

U-X

鈥?/div>

U-X

鈥?/div>

R/W-X

BC3

R/W-X

BC2

R/W-X

BC1

R/W-X

BC0

bit0

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

-n = Value at POR reset

X = Don鈥檛 care

bit 7-4:

Reserved:

Read as 鈥橷鈥?

bit 3-0:

BC<3:0>:

The Byte Count bits represent the number of bytes that will be transmitted for an IN TOKEN or

received during an OUT TOKEN. Valid byte counts are 0 - 8. The SIE will change this field upon the com-

pletion of an OUT or SETUP token with the actual byte count of the data received.

1B2h, 1B6h)

R/W-X

BA7

bit7

R/W-X

BA6

R/W-X

BA5

R/W-X

BA4

R/W-X

BA3

R/W-X

BA2

R/W-X

BA1

R/W-X

BA0

bit0

R = Readable bit

W = Writable bit

U = Unimplemented bit,

read as 鈥?鈥?/div>

-n = Value at POR reset

X = Don鈥檛 care

bit 7-0:

BA<7:0>:

Buffer Address. The base address of the buffer controlled by this endpoint. The upper order bit

address (BA8) of the 9-bit address is assumed to be 1h. This value must point to a location within the dual

port memory space (1B8h - 1DFh). The upper order bits of the address are assumed to point to Bank 3.

Note 1:

This register should always contain a value between B8h-DFh.

10.6.1

ENDPOINT BUFFERS

10.7.1.1

USB

Output

Endpoint buffers are located in the Dual Port RAM

area. The starting location of an endpoint buffer is

determined by the Buffer Descriptor.

The V

USB

provides a 3.3V nominal output. This drive

current is sufficient for a pull-up only.

10.8

USB Software Libraries

10.7

TRANSCEIVER

An on-chip integrated transceiver is included to drive

the D+/D- physical layer of the USB.

10.7.1

REGULATOR

Microchip Technology provides a comprehensive set

of Chapter 9 Standard requests functions to aid devel-

opers in implementing their designs. See Microchip

Technology鈥檚 website for the latest version of the soft-

ware libraries.

A 3.3V regulator provides the D+/D- drives with power.

A +20% 10nF capacitor is required on V

USB

for regula-

tor stability.

TABLE 10-1:

USB PORT FUNCTIONS

Function

USB

D-

Input

Type

鈥?/div>

USB

Output

Type

Power

USB

Description

3.3V for pull up resistor

USB Differential Bus

Name

USB

D-

D+

Legend:

D+

USB

OD = open drain, ST = Schmitt Trigger

DS41124A-page 70

Advanced Information

漏

1999 Microchip Technology Inc.

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