S9S12GN16F0CFT Freescale Semiconductor, S9S12GN16F0CFT Datasheet - Page 625

• Manufacturer Part Number: S9S12GN16F0CFT
• Description: 16-bit Microcontrollers - MCU 16-bit16k Flash 2k RAM
• Manufacturer: Freescale Semiconductor

Specifications of S9S12GN16F0CFT

• Rohs: yes
• Core: S12
• Processor Series: MC9S12G
• Data Bus Width: 16 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 16 KB
• Data Ram Size: 1024 B
• On-chip Adc: Yes
• Operating Supply Voltage: 3.13 V to 5.5 V
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: TSSOP-20
• Mounting Style: SMD/SMT

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 2.0A/B specification. (see
Figure
Freescale Semiconductor
•
•
•
18-44):
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 18-44. Segments within the Bit Time
MC9S12G Family Reference Manual, Rev.1.23
(PROP_SEG + PHASE_SEG1)
Tq
=
=
8 ... 25 Time Quanta
-------------------------------------------------------------------------------- -
(
Time Segment 1
number of Time Quanta
----------------------------------------------------- -
(
= 1 Bit Time
4 ... 16
Prescaler value
f
CANCLK
Freescale’s Scalable Controller Area Network (S12MSCANV3)
f
Tq
Sample Point
(single or triple sampling)
)
Time Segment 2
(PHASE_SEG2)
2 ... 8
)
Eqn. 18-2
Eqn. 18-3
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