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型号： DSPIC30F4013-30I/ML
厂商： Microchip Technology
文件页数： 19/153页
文件大小： 0K
描述： IC DSPIC MCU/DSP 48K 44QFN
产品培训模块： Serial Communications using dsPIC30F CAN
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
dsPIC30F 12-bit ADC Part 1
标准包装： 45
系列： dsPIC™ 30F
核心处理器： dsPIC
芯体尺寸： 16-位
速度： 30 MIP
连通性： CAN，I²C，SPI，UART/USART
外围设备： AC'97，欠压检测/复位，I²S，POR，PWM，WDT
输入/输出数： 30
程序存储器容量： 48KB（16K x 24）
程序存储器类型： 闪存
EEPROM 大小： 1K x 8
RAM 容量： 2K x 8
电压 - 电源 (Vcc/Vdd)： 2.5 V ~ 5.5 V
数据转换器： A/D 13x12b
振荡器型： 内部
工作温度： -40°C ~ 85°C
封装/外壳： 44-VQFN 裸露焊盘
包装： 管件
产品目录页面： 651 (CN2011-ZH PDF)
配用： XLT44QFN2-ND - SOCKET TRAN ICE 44QFN/40DIP
AC164322-ND - MODULE SOCKET MPLAB PM3 28/44QFN
DV164005-ND - KIT ICD2 SIMPLE SUIT W/USB CABLE
其它名称： DSPIC30F401330IML
2010 Microchip Technology Inc.
DS70138G-page 115
dsPIC30F3014/4013
Receive Error Interrupts:
A receive error interrupt is indicated by the ERRIF
bit. This bit shows that an error condition
occurred. The source of the error can be deter-
mined by checking the bits in the CAN Interrupt
register, CiINTF.
- Invalid Message Received:
If any type of error occurred during reception of
the last message, an error is indicated by the
IVRIF bit.
- Receiver Overrun:
The RXnOVR bit indicates that an overrun
condition occurred.
- Receiver Warning:
The RXWAR bit indicates that the Receive Error
Counter (RERRCNT<7:0>) has reached the
warning limit of 96.
- Receiver Error Passive:
The RXEP bit indicates that the Receive Error
Counter has exceeded the error passive limit of
127 and the module has gone into error passive
state.
17.5
Message Transmission
17.5.1
TRANSMIT BUFFERS
The CAN module has three transmit buffers. Each of
the three buffers occupies 14 bytes of data. Eight of the
bytes are the maximum 8 bytes of the transmitted mes-
sage. Five bytes hold the standard and extended
identifiers and other message arbitration information.
17.5.2
TRANSMIT MESSAGE PRIORITY
Transmit priority is a prioritization within each node of
the pending transmittable messages. There are
4 levels
of
transmit
priority.
If
TXPRI<1:0>
(CiTXnCON<1:0>, where n = 0, 1 or 2, represents a
particular transmit buffer) for a particular message buf-
fer is set to ‘11’, that buffer has the highest priority. If
TXPRI<1:0> for a particular message buffer is set to
‘10’ or ‘01’, that buffer has an intermediate priority. If
TXPRI<1:0> for a particular message buffer is ‘00’, that
buffer has the lowest priority.
17.5.3
TRANSMISSION SEQUENCE
To initiate transmission of the message, the TXREQ bit
(CiTXnCON<3>) must be set. The CAN bus module
resolves any timing conflicts between setting of the
TXREQ bit and the Start-of-Frame (SOF), ensuring that if
the priority was changed, it is resolved correctly before the
SOF occurs. When TXREQ is set, the TXABT
(CiTXnCON<6>), TXLARB (CiTXnCON<5>) and TXERR
(CiTXnCON<4>) flag bits are automatically cleared.
Setting TXREQ bit simply flags a message buffer as
enqueued for transmission. When the module detects
an available bus, it begins transmitting the message
which has been determined to have the highest priority.
If the transmission completes successfully on the first
attempt, the TXREQ bit is cleared automatically and an
interrupt is generated if TX1IE was set.
If the message transmission fails, one of the error
condition flags is set, and the TXREQ bit remains set,
indicating that the message is still pending for transmis-
sion. If the message encountered an error condition
during the transmission attempt, the TXERR bit is set,
and the error condition may cause an interrupt. If the
message loses arbitration during the transmission
attempt, the TXLARB bit is set. No interrupt is
generated to signal the loss of arbitration.
17.5.4
ABORTING MESSAGE
TRANSMISSION
The system can also abort a message by clearing the
TXREQ bit associated with each message buffer.
Setting the ABAT bit (CiCTRL<12>) requests an abort
of all pending messages. If the message has not yet
started transmission, or if the message started but is
interrupted by loss of arbitration or an error, the abort is
processed. The abort is indicated when the module
sets the TXABT bit and the TXnIF flag is not
automatically set.
17.5.5
TRANSMISSION ERRORS
The CAN module detects the following transmission
errors:
Acknowledge error
Form error
Bit error
These transmission errors do not necessarily generate
an interrupt but are indicated by the transmission error
counter. However, each of these errors causes the
transmission error counter to be incremented by one.
Once the value of the error counter exceeds the value
of 96, the ERRIF (CiINTF<5>) and the TXWAR bit
(CiINTF<10>) are set. Once the value of the error
counter exceeds the value of 96, an interrupt is
generated and the TXWAR bit in the Error Flag register
is set.
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