MC9S12P96CFT Freescale Semiconductor, MC9S12P96CFT Datasheet - Page 289
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MC9S12P96CFT
Manufacturer Part Number
MC9S12P96CFT
Description
MCU 16BIT 96K FLASH 48-QFN
Manufacturer
Freescale Semiconductor
Series
HCS12r
Datasheet
1.S9S12P32J0MFT.pdf
(566 pages)
Specifications of MC9S12P96CFT
Core Processor
HCS12
Core Size
16-Bit
Speed
32MHz
Connectivity
CAN, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
34
Program Memory Size
96KB (96K x 8)
Program Memory Type
FLASH
Eeprom Size
4K x 8
Ram Size
6K x 8
Voltage - Supply (vcc/vdd)
1.72 V ~ 5.5 V
Data Converters
A/D 10x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
48-QFN Exposed Pad
Processor Series
S12P
Core
HCS12
3rd Party Development Tools
EWHCS12
Development Tools By Supplier
KIT33812ECUEVME, DEMO9S12PFAME
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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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 8.3.2.2, “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 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.
8.4.3
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 (see Bosch CAN 2.0A/B
protocol specification):
Freescale Semiconductor
1. Although this mode can be used for standard identifiers, it is recommended to use the four or eight identifier acceptance
•
•
filters for standard identifiers
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.
Figure 8-40
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 8.3.2.18, “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 8.4.7.5, “Error
Section 8.3.2.12, “MSCAN Identifier Acceptance Control Register
S12P-Family Reference Manual, Rev. 1.13
(CANCTL1)”) where the MSCAN treats its own messages
Section 8.3.2.12, “MSCAN Identifier Acceptance
Interrupt”). The MSCAN remains able to transmit
Freescale’s Scalable Controller Area Network (S12MSCANV3)
(CANIDMR0–CANIDMR7)”).
289
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