MC908AZ32ACFU Freescale Semiconductor, MC908AZ32ACFU Datasheet - Page 230

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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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Analog-To-Digital Converter (ADC-15)
21.3.2 Voltage Conversion
When the input voltage to the ADC equals V
signal to $FF (full scale). If the input voltage equals V
between V
voltages is not guaranteed. Avoid current injection on unused ADC inputs to prevent potential conversion
error.
21.3.3 Conversion Time
Conversion starts after a write to the ADSCR (ADC status control register, $0038), and requires between
16 and 17 ADC clock cycles to complete. Conversion time in terms of the number of bus cycles is a
function of ADICLK select, CGMXCLK frequency, bus frequency, and ADIV prescaler bits. For example,
with a CGMXCLK frequency of 4 MHz, bus frequency of 8 MHz, and fixed ADC clock frequency of 1 MHz,
230
REFH
INTERNAL
DATA BUS
AIEN
Input voltage should not exceed the analog supply voltages.
INTERRUPT
and V
LOGIC
READ DDRB/DDRB
WRITE DDRB/DDRD
WRITE PTB/PTD
READ PTB/PTD
COCO
SSA
BUS CLOCK
CONVERSION
COMPLETE
CGMXCLK
are a straight-line linear conversion. Conversion accuracy of all other input
RESET
Figure 21-1. ADC Block Diagram
MC68HC908AZ32A Data Sheet, Rev. 2
ADIV[2:0]
ADC DATA REGISTER
CLOCK
GENERATOR
REFH
DDRBx/DDRDx
ADC
PTBx/PTDx
ADC CLOCK
(see
NOTE
ADICLK
SSA,
25.1.6 ADC
the ADC converts it to $00. Input voltages
ADC VOLTAGE IN
ADCVIN
Characteristics), the ADC converts the
DISABLE
DISABLE
CHANNEL
SELECT
ADC CHANNEL x
Freescale Semiconductor
PTBx/PTDx
ADCH[4:0]

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