mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 346

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Freescale’s Scalable Controller Area Network (S12MSCANV3)
11.4.5.7
The MSCAN is in disabled mode out of reset (CANE=0). All module clocks are stopped for power saving,
however the register map can still be accessed as specified.
11.4.5.8
The MSCAN can be programmed to wake up from sleep or power down mode as soon as CAN bus activity
is detected (see control bit WUPE in MSCAN Control Register 0 (CANCTL0). The sensitivity to existing
CAN bus action can be modified by applying a low-pass filter function to the RXCAN input line (see
control bit WUPM in
This feature can be used to protect the MSCAN from wake-up due to short glitches on the CAN bus lines.
Such glitches can result from—for example—electromagnetic interference within noisy environments.
11.4.6
The reset state of each individual bit is listed in
the registers and their bit-fields.
11.4.7
This section describes all interrupts originated by the MSCAN. It documents the enable bits and generated
flags. Each interrupt is listed and described separately.
11.4.7.1
The MSCAN supports four interrupt vectors (see
(for details see
Section 11.3.2.8, “MSCAN Transmitter Interrupt Enable Register
Refer to the device overview section to determine the dedicated interrupt vector addresses.
11.4.7.2
At least one of the three transmit buffers is empty (not scheduled) and can be loaded to schedule a message
for transmission. The TXEx flag of the empty message buffer is set.
346
Reset Initialization
Interrupts
Wake-Up Interrupt (WUPIF)
Error Interrupts Interrupt (CSCIF, OVRIF)
Receive Interrupt (RXF)
Transmit Interrupts (TXE[2:0])
Disabled Mode
Programmable Wake-Up Function
Description of Interrupt Operation
Transmit Interrupt
Section 11.3.2.6, “MSCAN Receiver Interrupt Enable Register
Section 11.3.2.2, “MSCAN Control Register 1
Interrupt Source
S12XS Family Reference Manual, Rev. 1.10
Table 11-39. Interrupt Vectors
Section 11.3.2, “Register
Table
CCR Mask
11-39), any of which can be individually masked
I bit
I bit
I bit
I bit
CANRIER (WUPIE)
CANRIER (CSCIE, OVRIE)
CANRIER (RXFIE)
CANTIER (TXEIE[2:0])
(CANTIER)”).
(CANCTL1)”).
Local Enable
Descriptions,” which details all
(CANRIER)” to
Freescale Semiconductor