S9S08SG8E2VTJR Freescale Semiconductor, S9S08SG8E2VTJR Datasheet - Page 146

• Manufacturer Part Number: S9S08SG8E2VTJR
• Description: 8-bit Microcontrollers - MCU 9S08 UC W/ 8K 0.25UM SGF
• Manufacturer: Freescale Semiconductor

Specifications of S9S08SG8E2VTJR

• Rohs: yes
• Core: HCS08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 40 MHz
• Program Memory Size: 8 KB
• Data Ram Size: 512 B
• On-chip Adc: Yes
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: TSSOP-20
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 12
• Interface Type: I2C, SCI, SPI
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 16
• Number Of Timers: 3
• Program Memory Type: Flash
• Supply Voltage - Max: 5.5 V
• Supply Voltage - Min: 2.7 V

Chapter 9 Analog-to-Digital Converter (S08ADC10V1)
9.4.4.2
A conversion is completed when the result of the conversion is transferred into the data result registers,
ADCRH and ADCRL. This is indicated by the setting of COCO. An interrupt is generated if AIEN is high
at the time that COCO is set.
A blocking mechanism prevents a new result from overwriting previous data in ADCRH and ADCRL if
the previous data is in the process of being read while in 10-bit MODE (the ADCRH register has been read
but the ADCRL register has not). When blocking is active, the data transfer is blocked, COCO is not set,
and the new result is lost. In the case of single conversions with the compare function enabled and the
compare condition false, blocking has no effect and ADC operation is terminated. In all other cases of
operation, when a data transfer is blocked, another conversion is initiated regardless of the state of ADCO
(single or continuous conversions enabled).
If single conversions are enabled, the blocking mechanism could result in several discarded conversions
and excess power consumption. To avoid this issue, the data registers must not be read after initiating a
single conversion until the conversion completes.
9.4.4.3
Any conversion in progress is aborted when:
When a conversion is aborted, the contents of the data registers, ADCRH and ADCRL, are not altered.
However, they continue to be the values transferred after the completion of the last successful conversion.
If the conversion was aborted by a reset, ADCRH and ADCRL return to their reset states.
9.4.4.4
The ADC module remains in its idle state until a conversion is initiated. If ADACK is selected as the
conversion clock source, the ADACK clock generator is also enabled.
Power consumption when active can be reduced by setting ADLPC. This results in a lower maximum value
for f
9.4.4.5
The total conversion time depends on the sample time (as determined by ADLSMP), the MCU bus
frequency, the conversion mode (8-bit or 10-bit), and the frequency of the conversion clock (
the module becomes active, sampling of the input begins. ADLSMP selects between short and long sample
times.When sampling is complete, the converter is isolated from the input channel and a successive
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ADCK
A write to ADCSC1 occurs (the current conversion will be aborted and a new conversion will be
initiated, if ADCH are not all 1s).
A write to ADCSC2, ADCCFG, ADCCVH, or ADCCVL occurs. This indicates a mode of
operation change has occurred and the current conversion is therefore invalid.
The MCU is reset.
The MCU enters stop mode with ADACK not enabled.
(see the electrical specifications).
Completing Conversions
Aborting Conversions
Power Control
Sample Time and Total Conversion Time
MC9S08SG32 Data Sheet, Rev. 8
Freescale Semiconductor
f
ADCK
). After