MC908AZ32ACFU Freescale Semiconductor, MC908AZ32ACFU Datasheet - Page 235

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MC908AZ32ACFU

Manufacturer Part Number
MC908AZ32ACFU
Description
IC MCU 32K FLASH 8.4MHZ 64-QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC908AZ32ACFU

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
CAN, SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
40
Program Memory Size
32KB (32K x 8)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
4.5 V ~ 5.5 V
Data Converters
A/D 15x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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ADIV2–ADIV0 — ADC Clock Prescaler Bits
ADICLK — ADC Input Clock Register Bit
Freescale Semiconductor
ADIV2, ADIV1, and ADIV0 form a 3-bit field which selects the divide ratio used by the ADC to generate
the internal ADC clock.
set to approximately 1 MHz.
ADICLK selects either bus clock or CGMXCLK as the input clock source to generate the internal ADC
clock. Reset selects CGMXCLK as the ADC clock source.
If the external clock (CGMXCLK) is equal to or greater than 1 MHz, CGMXCLK can be used as the
clock source for the ADC. If CGMXCLK is less than 1 MHz, use the PLL-generated bus clock as the
clock source. As long as the internal ADC clock is at approximately 1 MHz, correct operation can be
guaranteed. See
1 = Internal bus clock
0 = External clock (CGMXCLK)
During the conversion process, changing the ADC clock will result in an
incorrect conversion.
25.1.6 ADC
Table 21-2
X = don’t care
ADIV2
0
0
0
0
1
Characteristics.
Table 21-2. ADC Clock Divide Ratio
1 MHz = ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯
MC68HC908AZ32A Data Sheet, Rev. 2
shows the available clock configurations. The ADC clock should be
ADIV1
0
0
1
1
X
f
XCLK
ADIV0
NOTE
X
0
1
0
1
or Bus Frequency
ADIV[2:0]
ADC Input Clock / 16
ADC Input Clock / 2
ADC Input Clock / 4
ADC Input Clock / 8
ADC Input Clock /1
ADC Clock Rate
I/O Registers
235

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