XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 413

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

23.14.2 MSCAN08 Module Control Register 1
MC68HC908AZ60A — Rev 2.0
MOTOROLA
Address:
LOOPB — Loop Back Self-Test Mode
WUPM — Wakeup Mode
Reset:
Read:
Write:
When this bit is set, the MSCAN08 performs an internal loop back
which can be used for self-test operation: the bit stream output of the
transmitter is fed back to the receiver internally. The RxCAN input pin
is ignored and the TxCAN output goes to the recessive state (logic
‘1’). The MSCAN08 behaves as it does normally when transmitting
and treats its own transmitted message as a message received from
a remote node. In this state the MSCAN08 ignores the bit sent during
the ACK slot of the CAN frame Acknowledge field to insure proper
reception of its own message. Both transmit and receive interrupt are
generated.
This flag defines whether the integrated low-pass filter is applied to
protect the MSCAN08 from spurious wakeups (see
Wakeup Function
1 = Activate loop back self-test mode
0 = Normal operation
1 = MSCAN08 will wake up the CPU only in cases of a dominant
0 = MSCAN08 will wake up the CPU after any recessive to
$0501
Bit 7
Figure 23-16. Module Control Register (CMCR1)
pulse on the bus which has a length of at least t
dominant edge on the CAN bus.
0
0
MSCAN Controller (MSCAN08)
= Unimplemented
6
0
0
on page 398).
5
0
0
4
0
0
Programmer’s Model of Control Registers
3
0
0
MSCAN Controller (MSCAN08)
LOOPB
2
0
Programmable
WUPM
wup
1
0
Technical Data
.
CLKSRC
Bit 0
0
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