EVB9S08DZ60 Freescale Semiconductor, EVB9S08DZ60 Datasheet - Page 193

• Manufacturer Part Number: EVB9S08DZ60
• Description: BOARD EVAL FOR 9S08DZ60
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of EVB9S08DZ60

• Contents: Module and Misc Hardware
• Processor To Be Evaluated: S08D
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Silicon Manufacturer: Freescale
• Core Architecture: HCS08
• Core Sub-architecture: HCS08
• Silicon Core Number: MC9S08
• Silicon Family Name: S08D
• Kit Contents: Board Cables CD Power Supply
• Rohs Compliant: Yes
• For Use With/related Products: MC9S08DZ60
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

10.5
This section gives an example that provides some basic direction on how to initialize and configure the
ADC module. You can configure the module for 8-, 10-, or 12-bit resolution, single or continuous
conversion, and a polled or interrupt approach, among many other options. Refer to
Table
10.5.1
10.5.1.1
Before the ADC module can be used to complete conversions, an initialization procedure must be
performed. A typical sequence is as follows:
10.5.1.2
In this example, the ADC module is set up with interrupts enabled to perform a single 10-bit conversion
at low power with a long sample time on input channel 1, where the internal ADCK clock is derived from
the bus clock divided by 1.
ADCCFG = 0x98 (%10011000)
ADCSC2 = 0x00 (%00000000)
Freescale Semiconductor
1. Update the configuration register (ADCCFG) to select the input clock source and the divide ratio
2. Update status and control register 2 (ADCSC2) to select the conversion trigger (hardware or
3. Update status and control register 1 (ADCSC1) to select whether conversions will be continuous
10-8, and
used to generate the internal clock, ADCK. This register is also used for selecting sample time and
low-power configuration.
software) and compare function options, if enabled.
or completed only once, and to enable or disable conversion complete interrupts. The input channel
on which conversions will be performed is also selected here.
Initialization Information
Bit 7
Bit 6:5 ADIV
Bit 4
Bit 3:2 MODE
Bit 1:0 ADICLK
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3:2
Bit 1:0
ADC Module Initialization Example
Initialization Sequence
Pseudo-Code Example
Hexadecimal values designated by a preceding 0x, binary values designated
by a preceding %, and decimal values have no preceding character.
Table 10-9
ADLPC
ADLSMP
ADACT
ADTRG
ACFE
ACFGT
for information used in this example.
1
00
1
10
00
0
0
0
0
00
00
MC9S08DZ60 Series Data Sheet, Rev. 4
Configures for low power (lowers maximum clock speed)
Sets the ADCK to the input clock ÷ 1
Configures for long sample time
Sets mode at 10-bit conversions
Selects bus clock as input clock source
Flag indicates if a conversion is in progress
Software trigger selected
Compare function disabled
Not used in this example
Reserved, always reads zero
Reserved for Freescale’s internal use; always write zero
NOTE
Chapter 10 Analog-to-Digital Converter (S08ADC12V1)
Table
10-7,
193