MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 100
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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High Resolution PWM (HRP)
The formula for calculating the output duty cycle in variable duty cycle mode is:
where 2
In Variable Duty Cycle Mode, the individual periods and duty cycles are given by:
10.4.7 Dithering Controller
The dithering controller consists of a 5-bit counter with programmable modulus. The counter contents are
compared with a scaled version of the STEP[4:0] bits.
The modulus value (i.e., the total number of steps) and the STEP[4:0] scaling factor are set by the SEL
bits in the HRP configuration register.
STEP[4:0] bits is linked to the modulus value. For example, if a modulus of 32 is chosen, STEP[4:0] is not
scaled (32 steps of dithering are available). If a modulus of 16 is chosen, STEP[4:0] is divided by 2, so
that only 16 steps of dithering are available.
For example, if you decide to have 16 steps (SEL = 1) instead of the maximum of 32, and you set
STEP[4:0] equal to 23, then the scaled value of STEP will be 11 (i.e., the integer part of 23 divided by 2).
If you decide to have 4 steps instead of 32, the scaled value of 23 would be 2 (the integer part of 23 divided
by 8).
100
SEL[2:0]
is the STEP[4:0] scaling factor.
SEL
0
1
2
3
4
5
6
7
Output Duty Cycle
Table 10-3. Number of Steps and Step Scaling
DUTY2
PERIOD2
Number of Steps
PERIOD1
=
MC68HC908LB8 Data Sheet, Rev. 1
Reserved
Reserved
DUTY1
Table 10-3
DUTY1
32
16
=
=
8
4
2
0
DC 10:0
-------------------------
PERIOD1
HRPCLK
=
[
+
=
DC[10:0]
1
----------------------- -
HRPCLK
lists the available options. Note that the scaling of the
P[10:0]
=
]
+
DC[10:0]
=
------------------------------------------------- -
------------------ -
2
INT
SEL[2:0]
----------------------- -
HRPCLK
P[10:0]
32
⎛
⎝
STEP 4:0
---------------------------- -
Divide STEP[4:0] by...
2
+
¥
SEL[2:0]
1
HRPCLK
[
Reserved
Reserved
]
⎞
⎠
16
32
1
2
4
8
Freescale Semiconductor
(EQ 10-10)
(EQ 10-6)
(EQ 10-7)
(EQ 10-8)
(EQ 10-9)
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