S9S12GN16F0CFT Freescale Semiconductor, S9S12GN16F0CFT Datasheet - Page 489
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S9S12GN16F0CFT
Manufacturer Part Number
S9S12GN16F0CFT
Description
16-bit Microcontrollers - MCU 16-bit16k Flash 2k RAM
Manufacturer
Freescale Semiconductor
Datasheet
1.S9S12GN16F0CFT.pdf
(1292 pages)
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
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13.4
The ADC10B12C consists of an analog sub-block and a digital sub-block.
13.4.1
The analog sub-block contains all analog electronics required to perform a single conversion. Separate
power supplies VDDA and VSSA allow to isolate noise of other MCU circuitry from the analog sub-block.
13.4.1.1
The Sample and Hold Machine controls the storage and charge of the sample capacitor to the voltage level
of the analog signal at the selected ADC input channel.
During the sample process the analog input connects directly to the storage node.
The input analog signals are unipolar and must be within the potential range of VSSA to VDDA.
During the hold process the analog input is disconnected from the storage node.
13.4.1.2
The analog input multiplexer connects one of the 12 external analog input channels to the sample and hold
machine.
13.4.1.3
The A/D Machine performs analog to digital conversions. The resolution is program selectable to be either
8 or 10 bits. The A/D machine uses a successive approximation architecture. It functions by comparing the
sampled and stored analog voltage with a series of binary coded discrete voltages. By following a binary
search algorithm, the A/D machine identifies the discrete voltage that is nearest to the sampled and stored
voltage.
When not converting the A/D machine is automatically powered down.
Only analog input signals within the potential range of VRL to VRH (A/D reference potentials) will result
in a non-railed digital output code.
13.4.2
This subsection describes some of the digital features in more detail. See
Descriptions”
13.4.2.1
The external trigger feature allows the user to synchronize ATD conversions to an external event rather
than relying only on software to trigger the ATD module when a conversions is about to take place. The
external trigger signal (out of reset ATD channel 11, configurable in ATDCTL1) is programmable to be
Freescale Semiconductor
Functional Description
Analog Sub-Block
Digital Sub-Block
Sample and Hold Machine
Analog Input Multiplexer
Analog-to-Digital (A/D) Machine
External Trigger Input
for all details.
MC9S12G Family Reference Manual, Rev.1.23
Analog-to-Digital Converter (ADC10B12CV2)
Section 13.3.2, “Register
491
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