DEMO9S08EL32 Freescale Semiconductor, DEMO9S08EL32 Datasheet - Page 155

• Manufacturer Part Number: DEMO9S08EL32
• Description: BOARD DEMO FOR 9S08 EL MCU
• Manufacturer: Freescale Semiconductor
• Type: MCUr

Specifications of DEMO9S08EL32

• Contents: Evaluation Board
• Processor To Be Evaluated: MC9S08EL32
• Data Bus Width: 8 bit
• Interface Type: RS-232, USB
• Operating Supply Voltage: 12 V
• Silicon Manufacturer: Freescale
• Core Architecture: HCS08
• Core Sub-architecture: HCS08
• Silicon Core Number: MC9S08
• Silicon Family Name: S08EL
• Rohs Compliant: Yes
• For Use With/related Products: MC9S08EL32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

result of the conversion is transferred to ADCRH and ADCRL upon completion of the conversion
algorithm.
If the bus frequency is less than the f
cannot be guaranteed when short sample is enabled (ADLSMP=0). If the bus frequency is less than 1/11th
of the f
sample is enabled (ADLSMP=1).
The maximum total conversion time for different conditions is summarized in
The maximum total conversion time is determined by the clock source chosen and the divide ratio selected.
The clock source is selectable by the ADICLK bits, and the divide ratio is specified by the ADIV bits. For
example, in 10-bit mode, with the bus clock selected as the input clock source, the input clock divide-by-1
ratio selected, and a bus frequency of 8 MHz, then the conversion time for a single conversion is:
Freescale Semiconductor
ADCK
Single or first continuous 10-bit
Single or first continuous 10-bit
Single or first continuous 10-bit
Single or first continuous 10-bit
Subsequent continuous 10-bit;
Subsequent continuous 10-bit;
Single or first continuous 8-bit
Single or first continuous 8-bit
Single or first continuous 8-bit
Single or first continuous 8-bit
Subsequent continuous 8-bit;
Subsequent continuous 8-bit;
frequency, precise sample time for continuous conversions cannot be guaranteed when long
Conversion Type
Conversion time =
f
f
The ADCK frequency must be between f
maximum to meet ADC specifications.
BUS
BUS
f
f
BUS
BUS
> f
> f
> f
> f
ADCK
ADCK
ADCK
ADCK
Number of bus cycles = 3.5 μs x 8 MHz = 28 cycles
Table 10-12. Total Conversion Time vs. Control Conditions
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
/11
/11
ADCK
23 ADCK cyc
8 MHz/1
frequency, precise sample time for continuous conversions
ADICLK
0x, 10
0x, 10
0x, 10
0x, 10
11
11
11
11
xx
xx
xx
xx
NOTE
ADLSMP
+
ADCK
0
0
1
1
0
0
1
1
0
0
1
1
5 bus cyc
minimum and f
8 MHz
43 ADCK cycles + 5 bus clock cycles
20 ADCK cycles + 5 bus clock cycles
23 ADCK cycles + 5 bus clock cycles
40 ADCK cycles + 5 bus clock cycles
5 μs + 20 ADCK + 5 bus clock cycles
5 μs + 23 ADCK + 5 bus clock cycles
5 μs + 40 ADCK + 5 bus clock cycles
5 μs + 43 ADCK + 5 bus clock cycles
Analog-to-Digital Converter (S08ADC10V1)
Max Total Conversion Time
= 3.5 μs
17 ADCK cycles
20 ADCK cycles
37 ADCK cycles
40 ADCK cycles
ADCK
Table
10-12.
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