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

10.5.1.5

Status Register (USTAT)

The USB Status Register reports the transaction sta-

tus within the USB. When the MCU recognizes a

TOK_DNE interrupt, this register should be read to

determine the status of the previous endpoint commu-

nication. The data in the status register is valid when

the TOK_DNE interrupt bit is asserted.

The USTAT register is actually a read window into a

status FIFO maintained by the USB. When the USB

uses a BD, it updates the status register. If another

USB transaction is performed before the TOK_DNE

interrupt is serviced the USB will store the status of the

next transaction in the STAT FIFO. Thus, the STAT reg-

ister is actually a four byte FIFO which allows the MCU

to process one transaction while the SIE is processing

the next. Clearing the TOK_DNE bit in the INT_STAT

with the contents of the next STAT value. If the data in

the STAT holding register is valid, the SIE will immedi-

ately reassert the TOK_DNE interrupt.

U-0

鈥?/div>

bit7

U-0

鈥?/div>

U-0

鈥?/div>

R-X

ENDP1

R-X

ENDP0

R-X

U-0

鈥?/div>

U-0

鈥?/div>

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 7-5:

Unimplemented:

Read as 鈥?鈥?

bit 4-3:

ENDP<1:0>:

These bits encode the endpoint address that received or transmitted the previous token.

This allows the microprocessor to determine which BDT entry was updated by the last USB transaction.

bit 2:

IN:

This bit indicates the direction of the last BD that was updated.

= The last transaction was an IN TOKEN

= The last transaction was an OUT or SETUP TOKEN

bit 1-0:

Unimplemented:

Read as 鈥?鈥?

DS41124A-page 64

Advanced Information

漏

1999 Microchip Technology Inc.

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