MC9S08GT60ACFDE Freescale, MC9S08GT60ACFDE Datasheet - Page 210
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MC9S08GT60ACFDE
Manufacturer Part Number
MC9S08GT60ACFDE
Description
Manufacturer
Freescale
Datasheet
1.MC9S08GT60ACFDE.pdf
(302 pages)
Specifications of MC9S08GT60ACFDE
Cpu Family
HCS08
Device Core Size
8b
Frequency (max)
40MHz
Interface Type
I2C/SCI/SPI
Total Internal Ram Size
4KB
# I/os (max)
39
Number Of Timers - General Purpose
4
Operating Supply Voltage (typ)
2.5/3.3V
Operating Supply Voltage (max)
3.6V
Operating Supply Voltage (min)
1.8/2.08V
On-chip Adc
8-chx10-bit
Instruction Set Architecture
CISC
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
48
Package Type
QFN EP
Program Memory Type
Flash
Program Memory Size
60KB
Lead Free Status / RoHS Status
Compliant
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Inter-Integrated Circuit (S08IICV1)
210
MULT
Field
ICR
7:6
5:0
IIC Multiplier Factor — The MULT bits define the multiplier factor mul. This factor is used along with the SCL
divider to generate the IIC baud rate. The multiplier factor mul as defined by the MULT bits is provided below.
00 mul = 01
01 mul = 02
10 mul = 04
11 Reserved
IIC Clock Rate — The ICR bits are used to prescale the bus clock for bit rate selection. These bits are used to
define the SCL divider and the SDA hold value. The SCL divider multiplied by the value provided by the MULT
register (multiplier factor mul) is used to generate IIC baud rate.
SDA hold time is the delay from the falling edge of the SCL (IIC clock) to the changing of SDA (IIC data). The ICR
is used to determine the SDA hold value.
Table 13-3
be used to set IIC baud rate and SDA hold time. For example:
Table 13-3
hold value of 9.
If the generated SDA hold value is not acceptable, the MULT bits can be used to change the ICR. This will result
in a different SDA hold value.
IIC baud rate = bus speed (Hz)/(mul * SCL divider)
SDA hold time = bus period (s) * SDA hold value
Bus speed = 8 MHz
MULT is set to 01 (mul = 2)
Desired IIC baud rate = 100 kbps
IIC baud rate = bus speed (Hz)/(mul * SCL divider)
100000 = 8000000/(2*SCL divider)
SCL divider = 40
SDA hold time = bus period (s) * SDA hold value
SDA hold time = 1/8000000 * 9 = 1.125 μs
provides the SCL divider and SDA hold values for corresponding values of the ICR. These values can
shows that ICR must be set to 0B to provide an SCL divider of 40 and that this will result in an SDA
Table 13-2. IIC1F Register Field Descriptions
MC9S08GB60A Data Sheet, Rev. 2
Description
Freescale Semiconductor
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