MC68HC908AP8CB Freescale Semiconductor, MC68HC908AP8CB Datasheet - Page 71
MC68HC908AP8CB
Manufacturer Part Number
MC68HC908AP8CB
Description
IC MCU 8K FLASH 8MHZ 42SDIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC908AP8CFBE.pdf
(324 pages)
Specifications of MC68HC908AP8CB
Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
I²C, IRSCI, SCI, SPI
Peripherals
LED, LVD, POR, PWM
Number Of I /o
32
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
42-DIP (0.600", 15.24mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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Chapter 5
Oscillator (OSC)
5.1 Introduction
The oscillator module consist of three types of oscillator circuits:
The reference clock for the CGM and other MCU sub-systems is selected by programming the mask
option register located at $FFCF.
The reference clock for the timebase module (TBM) is selected by the two bits, OSCCLK1 and OSCCLK0,
in the CONFIG2 register.
The internal oscillator runs continuously after a POR or reset, and is always available. The RC and crystal
oscillator cannot run concurrently; one is disabled while the other is selected; because the RC and x-tal
circuits share the same OSC1 pin.
Figure
5.2 Clock Selection
Reference clocks are selectable for the following sub-systems:
Freescale Semiconductor
•
•
•
•
•
Internal oscillator
RC oscillator
32.768kHz crystal (x-tal) oscillator
CGMXCLK and CGMRCLK — Reference clock for clock generator module (CGM) and other MCU
sub-systems other than TBM and COP. This is the main reference clock for the MCU.
OSCCLK — Reference clock for timebase module (TBM).
5-1. shows the block diagram of the oscillator module.
The oscillator circuits are powered by the on-chip V
therefore, the output swing on OSC1 and OSC2 is from V
MC68HC908AP Family Data Sheet, Rev. 4
NOTE
REG
regulator,
SS
to V
REG
.
71
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