DIF: Data Interrupt Flag
參數(shù)資料
型號(hào): DSPIC30F3010-20I/SP
廠商: Microchip Technology
文件頁(yè)數(shù): 137/228頁(yè)
文件大小: 0K
描述: IC DSPIC MCU/DSP 24K 28DIP
產(chǎn)品培訓(xùn)模塊: dsPIC30F Quadrature Encoder Interface
Serial Communications using dsPIC30F I2C
Serial Communications using dsPIC30F SPI
Serial Communications using dsPIC30F UART
dsPIC30F 12 bit ADC - Part 2
dsPIC30F Addressing Modes - Part 1
dsPIC30F Architecture - Part 1
dsPIC30F DSP Engine & ALU
dsPIC30F Interrupts
dsPIC30F Motor Control PWM
dsPIC Timers
Asynchronous Stimulus
dsPIC30F Addressing Modes - Part 2
dsPIC30F Architecture - Part 2
標(biāo)準(zhǔn)包裝: 15
系列: dsPIC™ 30F
核心處理器: dsPIC
芯體尺寸: 16-位
速度: 20 MIPS
連通性: I²C,SPI,UART/USART
外圍設(shè)備: 高級(jí)欠壓探測(cè)/復(fù)位,電機(jī)控制 PWM,QEI,POR,PWM,WDT
輸入/輸出數(shù): 20
程序存儲(chǔ)器容量: 24KB(8K x 24)
程序存儲(chǔ)器類型: 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量: 1K x 8
電壓 - 電源 (Vcc/Vdd): 2.5 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 6x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 28-DIP(0.300",7.62mm)
包裝: 管件
其它名稱: DSPIC30F301020ISP
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221
XMEGA A [MANUAL]
8077I–AVR–11/2012
19.10.3 STATUS – Status register
Bit 7
DIF: Data Interrupt Flag
This fflag is set when a data byte is successfully received; i.e., no bus error or collision occurred during the operation.
Writing a one to this bit location will clear DIF. When this flag is set, the slave forces the SCL line low, stretching the TWI
clock period. Clearing the interrupt flags will release the SCL line.
This flag is also cleared automatically when writing a valid command to the CMD bits in the CTRLB register
Bit 6
APIF: Address/Stop Interrupt Flag
This flag is set when the slave detects that a valid address has been received, or when a transmit collision is detected. If
the PIEN bit in the CTRLA register is set, a STOP condition on the bus will also set APIF. Writing a one to this bit location
will clear APIF. When set for an address interrupt, the slave forces the SCL line low, stretching the TWI clock period.
Clearing the interrupt flags will release the SCL line.
The flag is also cleared automatically for the same condition as DIF.
Bit 5
CLKHOLD: Clock Hold
This flag is set when the slave is holding the SCL line low.This is a status flag and a read-only bit that is set when DIF or
APIF is set. Clearing the interrupt flags and releasing the SCL line will indirectly clear this flag.
Bit 4
RXACK: Received Acknowledge
This flag contains the most recently received acknowledge bit from the master. This is a read-only flag. When read as
zero, the most recent acknowledge bit from the maser was ACK, and when read as one, the most recent acknowledge bit
was NACK.
Bit 3
COLL: Collision
This flag is set when a slave has not been able to transfer a high data bit or a NACK bit. If a collision is detected, the
slave will commence its normal operation, disable data, and acknowledge output, and no low values will be shifted out
onto the SDA line. Writing a one to this bit location will clear COLL.
The flag is also cleared automatically when a START or repeated START condition is detected.
Bit 2
BUSERR: TWI Slave Bus Error
This flag is set when an illegal bus condition occurs during a transfer. An illegal bus condition occurs if a repeated START
or a STOP condition is detected, and the number of bits from the previous START condition is not a multiple of nine.
Writing a one to this bit location will clear BUSERR.
For bus errors to be detected, the bus state logic must be enabled. This is done by enabling the TWI master.
Bit 1
DIR: Read/Write Direction
The R/W direction (DIR) flag reflects the direction bit from the last address packet received from a master. When this bit
is read as one, a master read operation is in progress. When read as zero, a master write operation is in progress.
Bit 0
AP: Slave Address or Stop
This flag indicates whether a valid address or a STOP condition caused the last setting of APIF in the STATUS register.
Table 19-9. TWI slave address or stop.
Bit
76543210
+0x02
DIF
APIF
CLKHOLD
RXACK
COLL
BUSERR
DIR
AP
Read/Write
R/W
R
R/W
Initial Value
00000000
AP
Description
0
A STOP condition generated the interrupt on APIF
1
Address detection generated the interrupt on APIF
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