MC9S12C128VFU Freescale Semiconductor, MC9S12C128VFU Datasheet - Page 332

MC9S12C128VFU

Manufacturer Part Number
MC9S12C128VFU
Description
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC9S12C128VFU

Cpu Family
HCS12
Device Core Size
16b
Frequency (max)
25MHz
Interface Type
CAN/SCI/SPI
Program Memory Type
Flash
Program Memory Size
128KB
Total Internal Ram Size
4KB
# I/os (max)
60
Number Of Timers - General Purpose
8
Operating Supply Voltage (typ)
2.5/5V
Operating Supply Voltage (max)
2.75/5.5V
Operating Supply Voltage (min)
2.35/2.97V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 105C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
80
Package Type
PQFP
Lead Free Status / Rohs Status
Not Compliant

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Chapter 10 Freescale’s Scalable Controller Area Network (S12MSCANV2)
If the bus clock is generated from a PLL, it is recommended to select the oscillator clock rather than the
bus clock due to jitter considerations, especially at the faster CAN bus rates.
For microcontrollers without a clock and reset generator (CRG), CANCLK is driven from the crystal
oscillator (oscillator clock).
A programmable prescaler generates the time quanta (Tq) clock from CANCLK. A time quantum is the
atomic unit of time handled by the MSCAN.
A bit time is subdivided into three segments as described in the Bosch CAN specification. (see
43):
332
SYNC_SEG: This segment has a fixed length of one time quantum. Signal edges are expected to
happen within this section.
Time Segment 1: This segment includes the PROP_SEG and the PHASE_SEG1 of the CAN
standard. It can be programmed by setting the parameter TSEG1 to consist of 4 to 16 time quanta.
Time Segment 2: This segment represents the PHASE_SEG2 of the CAN standard. It can be
programmed by setting the TSEG2 parameter to be 2 to 8 time quanta long.
Transmit Point
SYNC_SEG
1
Bit Rate
NRZ Signal
Figure 10-43. Segments within the Bit Time
MC9S12C-Family / MC9S12GC-Family
(PROP_SEG + PHASE_SEG1)
Tq
=
=
8 ... 25 Time Quanta
-------------------------------------------------------------------------------- -
(
Time Segment 1
number of Time Quanta
----------------------------------------------------- -
(
= 1 Bit Time
4 ... 16
Prescaler value
Rev 01.24
f
CANCLK
f
Tq
Sample Point
(single or triple sampling)
)
Time Segment 2
(PHASE_SEG2)
2 ... 8
)
Freescale Semiconductor
Figure 10-
Eqn. 10-2
Eqn. 10-3

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