MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 107
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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DC[10:0] — 11-Bit Duty Cycle Value
STEP[4:0] — 5-Bit Dithering Step Value
10.8.3 HRP Period Registers
The two read/write period registers contain the 16-bit period of the PWM output after dithering. It is split
into two parts:
The output period including dithering in variable frequency mode is:
where 2
The output period in variable duty cycle mode does not include dithering. The period value is:
Writes to the high byte (HRPPERH) are stored in a latch until the low byte (HRPPERL) is written. Both
registers are then updated simultaneously. This prevents glitches in the output period.
Freescale Semiconductor
1. 11-bit period value (P[10:0]) used to generate the HRP’s output waveforms.
2. 5-bit step value (STEP[4:0]) the lower five bits of HRPPERH:HRPPERL, specifies how much time
is spent on the longer period (PERIOD2).
SEL[2:0]
Address: HRPDCH — $0052
Address: HRPPERH — $0054
is the STEP[4:0] scaling factor.
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
Output Period (seconds)
Figure 10-11. HRP Duty Cycle Registers (HRPDCH:HRPDCL)
Figure 10-12. HRP Period Registers (HRPPERH:HRPPERL)
Bit 15
DC10
Bit 15
Bit 7
DC2
Bit 7
P10
0
0
0
DC9
DC1
P9
14
14
0
0
0
6
6
HRPDCL — $0053
MC68HC908LB8 Data Sheet, Rev. 1
Period
HRPPERL — $0055
DC8
DC0
P8
13
13
0
5
0
0
5
=
=
----------------------- -
HRPCLK
P 10:0
------------------------- -
HRPCLK
[
P[10:0]
STEP4
DC7
P7
12
12
0
4
0
0
4
]
+
------------------------------------------------- -
------------------ -
2
INT
SEL[2:0]
32
STEP3
DC6
P6
11
11
0
0
⎛
⎝
0
3
3
STEP 4:0
---------------------------- -
2
¥
SEL[2:0]
HRPCLK
[
STEP2
DC5
P5
10
10
0
0
0
2
2
]
⎞
⎠
STEP1
DC4
P4
0
0
0
9
1
9
1
STEP0
Bit 8
DC3
Bit 0
Bit 8
Bit 0
P3
0
0
0
HRP Registers
(EQ 10-12)
(EQ 10-13)
107
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