MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 50

• Manufacturer Part Number: MC68HC908LB8CPE
• Description: IC MCU 8K FLASH 8MHZ 20DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908LB8CPE

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Peripherals: LVR, POR, PWM
• Number Of I /o: 18
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 7x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Connectivity: -

Analog-to-Digital Converter (ADC)
3.8.2 ADC Data Register
One 8-bit result register is provided. This register is updated each time an ADC conversion completes.
3.8.3 ADC Clock Register
The ADC clock register (ADCLK) selects the clock frequency for the ADC.
ADIV2–ADIV0 — ADC Clock Prescaler Bits
50
ADIV2–ADIV0 form a 3-bit field which selects the divide ratio used by the ADC to generate the internal
ADC clock.
approximately 1 MHz.
NOTES:
Address:
1. If any unused channels are selected, the resulting ADC conversion will be unknown or re-
2. V
Table 3-2
Reset:
Reset:
Read:
Read:
Write:
Write:
served.
REFH
and V
NOTES:
$003E
ADIV2
AD7
Bit 7
1. X = Don’t care
0
shows the available clock configurations. The ADC clock should be set to
ADIV2
Address:
REFL
0
0
0
0
1
Figure 3-5. ADC Clock Register (ADCLK)
= Unimplemented
= Unimplemented
are internally connected to V
ADIV1
Figure 3-4. ADC Data Register (ADR)
AD6
6
0
Table 3-2. ADC Clock Divide Ratio
$003F
ADIV1
MC68HC908LB8 Data Sheet, Rev. 1
X
0
0
1
1
(1)
ADIV0
AD5
5
0
ADIV0
X
0
1
0
1
(1)
Unaffected by reset
AD4
4
0
0
DD
ADC input clock ÷ 1
ADC input clock ÷ 2
ADC input clock ÷ 4
ADC input clock ÷ 8
ADC input clock ÷ 16
and V
AD3
3
0
0
ADC Clock Rate
SS
respectively.
AD2
2
0
0
AD1
1
0
0
Freescale Semiconductor
AD0
Bit 0
0
0