MC68HC908QT2CDW Freescale Semiconductor, MC68HC908QT2CDW Datasheet - Page 46

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MC68HC908QT2CDW

Manufacturer Part Number
MC68HC908QT2CDW
Description
IC MCU 1.5K FLASH W/ADC 8-SOIC
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC68HC908QT2CDW

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Peripherals
LVD, POR, PWM
Number Of I /o
5
Program Memory Size
1.5KB (1.5K x 8)
Program Memory Type
FLASH
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
8-SOIC (5.3mm Width), 8-SOP, 8-SOEIAJ
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Data Converters
-
Connectivity
-
Analog-to-Digital Converter (ADC)
AIEN — ADC Interrupt Enable Bit
When this bit is set, an interrupt is generated at the end of an ADC conversion. The interrupt signal is
cleared when ADR is read or ADSCR is written. Reset clears the AIEN bit.
1 = ADC interrupt enabled
0 = ADC interrupt disabled
ADCO — ADC Continuous Conversion Bit
When set, the ADC will convert samples continuously and update ADR at the end of each conversion.
Only one conversion is allowed when this bit is cleared. Reset clears the ADCO bit.
1 = Continuous ADC conversion
0 = One ADC conversion
CH[4:0] — ADC Channel Select Bits
CH4, CH3, CH2, CH1, and CH0 form a 5-bit field which is used to select one of the four ADC channels.
The five select bits are detailed in
analog and a digital input simultaneously to prevent switching noise from corrupting the analog signal.
The ADC subsystem is turned off when the channel select bits are all set to 1. This feature allows for
reduced power consumption for the MCU when the ADC is not used. Reset sets all of these bits to 1.
Recovery from the disabled state requires one conversion cycle to stabilize.
CH4
CH3
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1. If any unused channels are selected, the resulting ADC conversion will be
unknown.
2. The voltage levels supplied from internal reference nodes, as specified in the
table, are used to verify the operation of the ADC converter both in produc-
tion test and for user applications.
46
Table
3-1. Care should be taken when using a port pin as both an
NOTE
Table 3-1. MUX Channel Select
ADC
CH2
CH1
CH0
Channel
0
0
0
ADC0
0
0
1
ADC1
0
1
0
ADC2
0
1
1
ADC3
1
0
0
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
MC68HC908QY/QT Family Data Sheet, Rev. 6
Input Select
PTA0
PTA1
PTA4
PTA5
(1)
Unused
Reserved
Unused
(2)
V
DDA
(2)
V
SSA
ADC power off
Freescale Semiconductor

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