參數(shù)資料
型號: PIC16C745-I/SO
廠商: Microchip Technology
文件頁數(shù): 127/165頁
文件大?。?/td> 0K
描述: IC MCU OTP 8KX14 USB A/D 28SOIC
產(chǎn)品培訓(xùn)模塊: Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝: 27
系列: PIC® 16C
核心處理器: PIC
芯體尺寸: 8-位
速度: 24MHz
連通性: SCI,UART/USART,USB
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 22
程序存儲器容量: 14KB(8K x 14)
程序存儲器類型: OTP
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 4.35 V ~ 5.25 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 5x8b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-SOIC(0.295",7.50mm 寬)
包裝: 管件
產(chǎn)品目錄頁面: 636 (CN2011-ZH PDF)
配用: XLT28SO-1-ND - SOCKET TRANSITION 28SOIC 300MIL
ISPICR1-ND - ADAPTER IN-CIRCUIT PROGRAMMING
PIC16C745/765
DS41124C-page 64
Preliminary
2000 Microchip Technology Inc.
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
register is actually a four byte FIFO which allows the
MCU to process one transaction while the SIE is pro-
cessing the next. Clearing the TOK_DNE bit in the
INT_STAT register causes the SIE to update the STAT
register with the contents of the next STAT value. If the
data in the STAT holding register is valid, the SIE will
immediately reassert the TOK_DNE interrupt.
REGISTER 10-5:
USB STATUS REGISTER (USTAT: 194h)
U-0
R-X
U-0
ENDP1
ENDP0
IN
R = Readable bit
W = Writable bit
U = Unimplemented bit,
read as ‘0’
-n = Value at POR reset
X = Don’t care
bit7
bit0
bit 7-5:
Unimplemented: Read as ’0’
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
1
= The last transaction was an IN TOKEN
0
= The last transaction was an OUT or SETUP TOKEN
bit 1-0:
Unimplemented: Read as ’0’
745cov.book Page 64 Wednesday, August 2, 2000 8:24 AM
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