MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 111
MC68HC908LB8CPE
Manufacturer Part Number
MC68HC908LB8CPE
Description
IC MCU 8K FLASH 8MHZ 20DIP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet
1.MC68HC908LB8CDWE.pdf
(234 pages)
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
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68HC908LB8CPE
Manufacturer:
IR
Quantity:
10
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Example 2
This example shows how to configure the module to output a frequency of 81.5 kHz, with a deadtime of
10 µs. The system has an HRPCLK of 8 MHz, and the switching frequency must be less than 100 Hz.
If we use 32 steps, simplifying the last equation gives
If we choose STEP[4:0] = 5, the output frequency = 81.5027 kHz.
In this case (using the output of the dual frequency generator as source for the dithering timebase),
To achieve a switching frequency of less than 100 Hz, we must use the 16-bit timebase counter as the
source for the dithering timebase.
To insert a 10 µs deadtime in the output signals, we must calculate the value to store in the HRPDT
register from the following equation.
Freescale Semiconductor
Period (seconds)
P 10:0
Switching Frequency
[
]
P 10:0
+
HRPTB
[
INT
-------------------------------------------- -
STEP 4:0
⎛
⎝
]
------------------ -
2
Switching Frequency
STEP 4:0
---------------------------- -
=
=
SEL[2:0]
2
i.e.
32
=
---------- -
81.5
10
SEL[2:0]
[
98
--------------------------- -
100
–
HRPCLK
[
HRPDT
3
=
=
]
Dead Time
=
STEP 4:0
---------------------------- -
=
MC68HC908LB8 Data Sheet, Rev. 1
10
Output Frequency
----------------------------------------------- -
$62
¥
]
12.2699
⎞
⎠
2
0.1592
¥
SEL
32
=
10
and
[
=
12.2699
2
–
=
10
SEL
6
]
¥
INT
-------------------------------------------- -
=
¥
---------------------- -
100
=
8
¥
32
=
10
=
------------------------- -
HRPCLK
¥
HRPDT
------------------- -
8
8
HRPDT
0.1592
⎛
⎝
¥
–
10
--------------------------------------- -
HRPTB
¥
¥
------------------ -
2
=
STEP 4:0
---------------------------- -
=
6
SEL[2:0]
32
10
8
2
6
32
=
HRPCLK
5.094
80
SEL[2:0]
=
=
6
P 10:0
--------------------
=
8
[
=
[
98.1592
81.5027
-------------------- -
¥
2500
¥
$50
10
=
32
]
2
⎞
⎠
6
5 or 6
SEL
]
+
=
=
INT
-------------------------------------------- -
------------------ -
2
=
0.1592
=
$9C4
SEL[2:0]
32
98
2.5469 kHz
⎛
⎝
STEP 4:0
---------------------------- -
+
2
0.1592
SEL[2:0]
¥
8
[
¥
10
HRP Programming Examples
]
⎞
⎠
6
(EQ 10-21)
(EQ 10-22)
(EQ 10-23)
(EQ 10-24)
(EQ 10-25)
(EQ 10-26)
(EQ 10-27)
(EQ 10-28)
(EQ 10-29)
(EQ 10-30)
(EQ 10-31)
111
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