S9S12G96F0MLH Freescale Semiconductor, S9S12G96F0MLH Datasheet - Page 620
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S9S12G96F0MLH
Manufacturer Part Number
S9S12G96F0MLH
Description
16-bit Microcontrollers - MCU 16BIT 96K FLASH
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S12G96F0CLL.pdf
(1292 pages)
Specifications of S9S12G96F0MLH
Rohs
yes
Core
S12
Processor Series
MC9S12G
Data Bus Width
16 bit
Maximum Clock Frequency
25 MHz
Program Memory Size
96 KB
Data Ram Size
8192 B
On-chip Adc
Yes
Operating Supply Voltage
3.13 V to 5.5 V
Operating Temperature Range
- 40 C to + 125 C
Package / Case
LQFP-64
Mounting Style
SMD/SMT
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Freescale’s Scalable Controller Area Network (S12MSCANV3)
message in its RxBG (wrong identifier, transmission errors, etc.) the actual contents of the buffer will be
over-written by the next message. The buffer will then not be shifted into the FIFO.
When the MSCAN module is transmitting, the MSCAN receives its own transmitted messages into the
background receive buffer, RxBG, but does not shift it into the receiver FIFO, generate a receive interrupt,
or acknowledge its own messages on the CAN bus. The exception to this rule is in loopback mode (see
Section 18.3.2.2, “MSCAN Control Register 1
exactly like all other incoming messages. The MSCAN receives its own transmitted messages in the event
that it loses arbitration. If arbitration is lost, the MSCAN must be prepared to become a receiver.
An overrun condition occurs when all receive message buffers in the FIFO are filled with correctly
received messages with accepted identifiers and another message is correctly received from the CAN bus
with an accepted identifier. The latter message is discarded and an error interrupt with overrun indication
is generated if enabled (see
messages while the receiver FIFO is being filled, but all incoming messages are discarded. As soon as a
receive buffer in the FIFO is available again, new valid messages will be accepted.
18.4.3
The MSCAN identifier acceptance registers (see
Control Register
(ID[10:0] or ID[28:0]). Any of these bits can be marked ‘don’t care’ in the MSCAN identifier mask
registers (see
A filter hit is indicated to the application software by a set receive buffer full flag (RXF = 1) and three bits
in the CANIDAC register (see
(CANIDAC)”). These identifier hit flags (IDHIT[2:0]) clearly identify the filter section that caused the
acceptance. They simplify the application software’s task to identify the cause of the receiver interrupt. If
more than one hit occurs (two or more filters match), the lower hit has priority.
A very flexible programmable generic identifier acceptance filter has been introduced to reduce the CPU
interrupt loading. The filter is programmable to operate in four different modes:
622
•
•
Two identifier acceptance filters, each to be applied to:
— The full 29 bits of the extended identifier and to the following bits of the CAN 2.0B frame:
— The 11 bits of the standard identifier plus the RTR and IDE bits of the CAN 2.0A/B messages.
Four identifier acceptance filters, each to be applied to:
– Remote transmission request (RTR)
– Identifier extension (IDE)
– Substitute remote request (SRR)
This mode implements two filters for a full length CAN 2.0B compliant extended identifier.
Although this mode can be used for standard identifiers, it is recommended to use the four or
eight identifier acceptance filters.
Figure 18-40
CANIDMR0–CANIDMR3) produces a filter 0 hit. Similarly, the second filter bank
(CANIDAR4–CANIDAR7, CANIDMR4–CANIDMR7) produces a filter 1 hit.
Identifier Acceptance Filter
Section 18.3.2.18, “MSCAN Identifier Mask Registers
(CANIDAC)”) define the acceptable patterns of the standard or extended identifier
shows how the first 32-bit filter bank (CANIDAR0–CANIDAR3,
Section 18.4.7.5, “Error
Section 18.3.2.12, “MSCAN Identifier Acceptance Control Register
MC9S12G Family Reference Manual,
(CANCTL1)”) where the MSCAN treats its own messages
Section 18.3.2.12, “MSCAN Identifier Acceptance
Interrupt”). The MSCAN remains able to transmit
Rev.1.23
(CANIDMR0–CANIDMR7)”).
Freescale Semiconductor
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