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MCP2510-IST Datasheet(PDF) 52 Page - Microchip Technology

Part # MCP2510-IST
Description  Stand-Alone CAN Controller with SPI Interface
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP2510-IST Datasheet(HTML) 52 Page - Microchip Technology

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MCP2510
DS21291C-page 52
Preliminary
 2000 Microchip Technology Inc.
9.4
Loopback Mode
This mode will allow internal transmission of messages
from the transmit buffers to the receive buffers without
actually transmitting messages on the CAN bus. This
mode can be used in system development and testing.
In this mode the ACK bit is ignored and the device will
allow incoming messages from itself just as if they were
coming from another node. The loopback mode is a
silent mode, meaning no messages will be transmitted
while in this state, including error flags or acknowledge
signals. The TXCAN pin will be in a reccessive state
while the device is in this mode. The filters and masks
can be used to allow only particular messages to be
loaded into the receive registers. The masks can be set
to all zeros to provide a mode that accepts all mes-
sages. The loopback mode is activated by setting the
mode request bits in the CANCTRL register.
9.5
Normal Mode
This is the standard operating mode of the MCP2510.
In this mode the device actively monitors all bus mes-
sages and generates acknowledge bits, error frames,
etc. This is also the only mode in which the MCP2510
will transmit messages over the CAN bus.
REGISTER 9-1:
CANCTRL - CAN Control Register (ADDRESS: xFh)
R/W-1
R/W-1
R/W-1
R/W-0
U-0
R/W-1
R/W-1
R/W-1
REQOP2 REQOP1 REQOP0
ABAT
CLKEN CLKPRE1CLKPRE0
R = Readable bit
W = Writable bit
C = Bit can be cleared by
MCU but not set
U = Unimplemented -
reads as ‘0’
- n = Value at POR reset
bit 7
bit 0
bit 7-5:
REQOP<2:0>: Request Operation Mode
000 = Set Normal Operation Mode
001 = Set Sleep Mode
010 = Set Loopback Mode
011 = Set Listen Only Mode
100 = Set Configuration Mode
All other values for REQOP bits are invalid and should not be used
bit 4:
ABAT: Abort All Pending Transmissions
1 = Request abort of all pending transmit buffers
0 = Terminate request to abort all transmissions
bit 3:
Unimplemented: Reads as ‘0’
bit 2:
CLKEN: CLKOUT Pin Enable
0 = CLKOUT pin disabled (Pin is in high impedance state)
1 =CLKOUT pin enabled
bit 1-0:
CLKPRE<1:0>: CLKOUT Pin Prescaler
00 = FCLKOUT = System Clock/1
01 = FCLKOUT = System Clock/2
10 = FCLKOUT = System Clock/4
11 = FCLKOUT = System Clock/8


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