參數(shù)資料
型號： DSPIC33FJ16GP304T-I/ML
廠商： Microchip Technology
文件頁數(shù)： 172/176頁
文件大?。?/td> 0K
描述： IC DSPIC MCU/DSP 16K 44QFN
產(chǎn)品培訓(xùn)模塊： Asynchronous Stimulus
標準包裝： 1,600
系列： dsPIC™ 33F
核心處理器： dsPIC
芯體尺寸： 16-位
速度： 40 MIP
連通性： I²C，IrDA，LIN，SPI，UART/USART
外圍設(shè)備： 欠壓檢測/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 35
程序存儲器容量： 16KB（16K x 8）
程序存儲器類型： 閃存
RAM 容量： 2K x 8
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 13x12b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-VQFN 裸露焊盤
包裝： 帶卷 (TR)
配用： DV164033-ND - KIT START EXPLORER 16 MPLAB ICD2
DM240001-ND - BOARD DEMO PIC24/DSPIC33/PIC32
其它名稱： DSPIC33FJ16GP304T-I/MLTR
94
AT89C5131
4136C–USB–04/05
Error Conditions
The following flags in the SPSTA signal SPI error conditions:
Mode Fault (MODF)
Mode Fault error in Master mode SPI indicates that the level on the Slave Select (SS)
pin is inconsistent with the actual mode of the device. MODF is set to warn that there
may have a multi-master conflict for system control. In this case, the SPI system is
affected in the following ways:
An SPI receiver/error CPU interrupt request is generated,
The SPEN bit in SPCON is cleared. This disable the SPI,
The MSTR bit in SPCON is cleared
When SS DISable (SSDIS) bit in the SPCON register is cleared, the MODF flag is set
when the SS signal becomes “0”.
However, as stated before, for a system with one Master, if the SS pin of the Master
device is pulled low, there is no way that another Master attempt to drive the network. In
this case, to prevent the MODF flag from being set, software can set the SSDIS bit in the
SPCON register and therefore making the SS pin as a general-purpose I/O pin.
Clearing the MODF bit is accomplished by a read of SPSTA register with MODF bit set,
followed by a write to the SPCON register. SPEN Control bit may be restored to its orig-
inal set state after the MODF bit has been cleared.
Write Collision (WCOL)
A Write Collision (WCOL) flag in the SPSTA is set when a write to the SPDAT register is
done during a transmit sequence.
WCOL does not cause an interruption, and the transfer continues uninterrupted.
Clearing the WCOL bit is done through a software sequence of an access to SPSTA
and an access to SPDAT.
Overrun Condition
An overrun condition occurs when the Master device tries to send several data bytes
and the Slave devise has not cleared the SPIF bit issuing from the previous data byte
transmitted. In this case, the receiver buffer contains the byte sent after the SPIF bit was
last cleared. A read of the SPDAT returns this byte. All others bytes are lost.
This condition is not detected by the SPI peripheral.
Interrupts
Two SPI status flags can generate a CPU interrupt requests:
Table 74. SPI Interrupts
Serial Peripheral data transfer flag, SPIF: This bit is set by hardware when a transfer
has been completed. SPIF bit generates transmitter CPU interrupt requests.
Mode Fault flag, MODF: This bit becomes set to indicate that the level on the SS is
inconsistent with the mode of the SPI. MODF with SSDIS reset, generates receiver/error
CPU interrupt requests.
Figure 45 gives a logical view of the above statements.
Flag
Request
SPIF (SP Data Transfer)
SPI Transmitter Interrupt request
MODF (Mode Fault)
SPI Receiver/Error Interrupt Request (if SSDIS = “0”)
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