参数资料
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: 18/88页
文件大小: 1205K
代理商: MCP2515-E/PG
2010 Microchip Technology Inc.
DS21801F-page 25
MCP2515
4.4.3
CONFIGURED AS DIGITAL OUTPUT
When used as digital outputs, the BFPCTRL.BxBFM bit
must be cleared and BFPCTRL.BnBFE must be set for
the associated buffer. In this mode, the state of the pin
is controlled by the BFPCTRL.BnBFS bits. Writing a ‘1’
to the BnBFS bit will cause a high level to be driven on
the associated buffer full pin, while a ‘0’ will cause the
pin to drive low. When using the pins in this mode, the
state of the pin should be modified only by using the Bit
Modify SPI command to prevent glitches from
occurring on either of the buffer full pins.
TABLE 4-1:
CONFIGURING RXNBF PINS
FIGURE 4-2:
RECEIVE BUFFER BLOCK DIAGRAM
BnBFE BnBFM BnBFS
Pin Status
0XX
Disabled, high-impedance
11X
Receive buffer interrupt
100
Digital output = 0
101
Digital output = 1
Acceptance Mask
RXM1
Acceptance Filter
RXF2
Acceptance Filter
RXF3
Acceptance Filter
RXF4
Acceptance Filter
RXF5
Acceptance Mask
RXM0
Acceptance Filter
RXF0
Acceptance Filter
RXF1
Identifier
Data Field
Identifier
Note:
Messages received in the MAB are intially
applied to the mask and filters of RXB0. In
addition, only one filter match occurs (e.g.,
if the message matches both RXF0 and
RXF2, the match will be for RXF0 and the
message will be moved into RXB0).
A
c
e
p
t
A
c
e
p
t
R
X
B
0
R
X
B
1
M
A
B
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