MC68HC908GR8CD Freescale Semiconductor, MC68HC908GR8CD Datasheet - Page 55

• Manufacturer Part Number: MC68HC908GR8CD
• Description: 8-bit Microcontrollers - MCU 8 Bit 8MHz
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908GR8CD

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: HC08
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 8 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 384 B
• Operating Supply Voltage: 3 V to 5 V
• Package / Case: SOIC-28
• Mounting Style: SMD/SMT
• Data Rom Size: 64 KB
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 21
• Program Memory Type: Flash

Chapter 5
Analog-to-Digital Converter (ADC)
5.1 Introduction
This section describes the 8-bit analog-to-digital converter (ADC).
For further information regarding analog-to-digital converters on Freescale microcontrollers, please
consult the HC08 ADC Reference Manual, ADCRM/AD.
5.2 Features
Features of the ADC module include:
5.3 Functional Description
The ADC provides six pins for sampling external sources at pins PTB5/ATD5–PTB0/ATD0. An analog
multiplexer allows the single ADC converter to select one of six ADC channels as ADC voltage in (V
V
conversion is completed, ADC places the result in the ADC data register and sets a flag or generates an
interrupt. See
5.3.1 ADC Port I/O Pins
PTB5/ATD5–PTB0/ATD0 are general-purpose I/O (input/output) pins that share with the ADC channels.
The channel select bits define which ADC channel/port pin will be used as the input signal. The ADC
overrides the port I/O logic by forcing that pin as input to the ADC. The remaining ADC channels/port pins
are controlled by the port I/O logic and can be used as general-purpose I/O. Writes to the port register or
DDR will not have any affect on the port pin that is selected by the ADC. Read of a port pin in use by the
ADC will return a 0 if the corresponding DDR bit is a 0. If the DDR bit is a 1, the value in the port data latch
is read.
Freescale Semiconductor
ADIN
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is converted by the successive approximation register-based analog-to-digital converter. When the
Six channels with multiplexed input
Linear successive approximation with monotonicity
8-bit resolution
Single or continuous conversion
Conversion complete flag or conversion complete interrupt
Selectable ADC clock
Figure
5-1.
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
ADIN
55
).