MC9S08GT8AMFDE Freescale Semiconductor, MC9S08GT8AMFDE Datasheet - Page 127
![IC MCU 8K FLASH 1K RAM 48-QFN](/photos/12/16/121612/mc9s08gt8amfde_sml.jpg)
MC9S08GT8AMFDE
Manufacturer Part Number
MC9S08GT8AMFDE
Description
IC MCU 8K FLASH 1K RAM 48-QFN
Manufacturer
Freescale Semiconductor
Series
HCS08r
Datasheet
1.MC9S08GT8ACFBER.pdf
(300 pages)
Specifications of MC9S08GT8AMFDE
Core Processor
HCS08
Core Size
8-Bit
Speed
40MHz
Connectivity
I²C, SCI, SPI
Peripherals
LVD, POR, PWM, WDT
Number Of I /o
39
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
1K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
48-QFN
Processor Series
S08GT
Core
HCS08
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
I2C/SCI/SPI
Maximum Clock Frequency
40 MHz
Number Of Programmable I/os
39
Operating Supply Voltage
3.6 V
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
3rd Party Development Tools
EWS08
Development Tools By Supplier
M68EVB908GB60E, M68DEMO908GB60E
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
Package
48QFN EP
Family Name
HCS08
Maximum Speed
40 MHz
For Use With
M68DEMO908GB60E - BOARD DEMO MC9S08GB60M68EVB908GB60E - BOARD EVAL FOR MC9S08GB60
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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The ICG provides multiple options for clock sources. This offers a user great flexibility when making
choices between cost, precision, current draw, and performance. The ICG consists of four functional
blocks. Each of these is briefly described here and then in more detail in a later section.
9.1.1
The module is intended to be very user friendly with many of the features occurring automatically without
user intervention. To quickly configure the module, go to
Information” and pick an example that best suits the application needs.
Features of the ICG and clock distribution system:
Freescale Semiconductor
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Oscillator block — The oscillator block provides means for connecting an external crystal or
resonator. Two frequency ranges are software selectable to allow optimal startup and stability.
Alternatively, the oscillator block can be used to route an external square wave to the system clock.
External sources can provide a very precise clock source. The oscillator is capable of being
configured for low power mode or high amplitude mode as selected by HGO.
Internal reference generator — The internal reference generator consists of two controlled clock
sources. One is designed to be approximately 8 MHz and can be selected as a local clock for the
background debug controller. The other internal reference clock source is typically 243 kHz and
can be trimmed for finer accuracy via software when a precise timed event is input to the MCU.
This provides a highly reliable, low-cost clock source.
Frequency-locked loop — A frequency-locked loop (FLL) stage takes either the internal or
external clock source and multiplies it to a higher frequency. Status bits provide information when
the circuit has achieved lock and when it falls out of lock. Additionally, this block can monitor the
external reference clock and signals whether the clock is valid or not.
Clock select block — The clock select block provides several switch options for connecting
different clock sources to the system clock tree. ICGDCLK is the multiplied clock frequency out
of the FLL, ICGERCLK is the reference clock frequency from the crystal or external clock source,
and FFE (fixed frequency enable) is a control signal used to control the system fixed frequency
clock (XCLK). ICGLCLK is the clock source for the background debug controller (BDC).
Several options for the primary clock source allow a wide range of cost, frequency, and precision
choices:
— 32 kHz–100 kHz crystal or resonator
— 1 MHz–16 MHz crystal or resonator
— External clock
— Internal reference generator
Defaults to self-clocked mode to minimize startup delays
Frequency-locked loop (FLL) generates 8 MHz to 40 MHz (for bus rates up to 20 MHz)
— Uses external or internal clock as reference frequency
Automatic lockout of non-running clock sources
Reset or interrupt on loss of clock or loss of FLL lock
Features
MC9S08GT16A/GT8A Data Sheet, Rev. 1
Section 9.5, “Initialization/Application
Internal Clock Generator (S08ICGV4)
127
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