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| 型号： | MCP2515-E/PG |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 1 CHANNEL(S), 1M bps, SERIAL COMM CONTROLLER, PDIP18 |
| 封装： | 0.300 INCH, LEAD FREE, PLASTIC, DIP-18 |
| 文件页数： | 61/88页 |
| 文件大小： | 1205K |
| 代理商： | MCP2515-E/PG |
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MCP2515
DS21801F-page 64
2010 Microchip Technology Inc.
Each status bit returned in this command may also be
read by using the standard read command with the
appropriate register address.
12.9
RX Status Instruction
The RX Status instruction (Figure 12-9) is used to
quickly determine which filter matched the message
and message type (standard, extended, remote). After
the command byte is sent, the controller will return
8 bits of data that contain the status data. If more clocks
are sent after the 8 bits are transmitted, the controller
will continue to output the same status bits as long as
the CS pin stays low and clocks are provided.
12.10 Bit Modify Instruction
The Bit Modify instruction provides a means for setting
or clearing individual bits in specific status and control
registers. This command is not available for all
registers. See Section 11.0 “Register Map” to
determine which registers allow the use of this
command.
The part is selected by lowering the CS pin and the Bit
Modify command byte is then sent to the MCP2515.
The command is followed by the address of the
register, the mask byte and finally the data byte.
The mask byte determines which bits in the register will
be allowed to change. A ‘1’ in the mask byte will allow
a bit in the register to change, while a ‘0’ will not.
The data byte determines what value the modified bits
in the register will be changed to. A ‘1’ in the data byte
will set the bit and a ‘0’ will clear the bit, provided that
the mask for that bit is set to a ‘1’ (see Figure 12-7).
FIGURE 12-1:
BIT MODIFY
TABLE 12-1:
SPI INSTRUCTION SET
Note:
Executing the Bit Modify command on
registers that are not bit-modifiable will
force the mask to FFh. This will allow byte-
writes to the registers, not bit modify.
Mask byte
Data byte
Previous
Register
Contents
Resulting
Register
Contents
00 1
1
11
00
XX 1
1
00
XX
01 0
1
10
00
01 1
1
00
Instruction Name
Instruction Format
Description
RESET
1100 0000
Resets internal registers to default state, set Configuration mode.
READ
0000 0011
Read data from register beginning at selected address.
Read RX Buffer
1001 0nm0
When reading a receive buffer, reduces the overhead of a normal
read command by placing the address pointer at one of four
locations, as indicated by ‘n,m’. Note: The associated RX flag bit
(CANINTF.RXnIF) will be cleared after bringing CS high.
WRITE
0000 0010
Write data to register beginning at selected address.
Load TX Buffer
0100 0abc
When loading a transmit buffer, reduces the overhead of a normal
Write command by placing the address pointer at one of six
locations as indicated by ‘a,b,c’.
RTS
(Message
Request-To-Send)
1000 0nnn
Instructs controller to begin message transmission sequence for
any of the transmit buffers.
Read Status
1010 0000
Quick polling command that reads several status bits for transmit
and receive functions.
RX Status
1011 0000
Quick polling command that indicates filter match and message
type (standard, extended and/or remote) of received message.
Bit Modify
0000 0101
Allows the user to set or clear individual bits in a particular
register. Note: Not all registers can be bit-modified with this
command. Executing this command on registers that are not bit-
modifiable will force the mask to FFh. See the register map in
Section 11.0 “Register Map” for a list of the registers that apply.
1000 0nnn
Request-to-send for TXBO
Request-to-send for TXB1
Request-to-send for TXB2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP2515-I | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Stand-Alone CAN Controller with SPI Interface |
| MCP2515-I/ML | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Stand-Alone CAN Controller with SPI Interface |
| MCP2515-I/P | 功能描述:网络控制器与处理器 IC W/ SPI Interface RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
| MCP2515-I/P | 制造商:Microchip Technology Inc 功能描述:CAN controller IC |
| MCP2515-I/SO | 功能描述:网络控制器与处理器 IC W/ SPI Interface RoHS:否 制造商:Micrel 产品:Controller Area Network (CAN) 收发器数量: 数据速率: 电源电流（最大值）:595 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:PBGA-400 封装:Tray |
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