MC68HC908LB8CPE Freescale Semiconductor, MC68HC908LB8CPE Datasheet - Page 144

• Manufacturer Part Number: MC68HC908LB8CPE
• Description: IC MCU 8K FLASH 8MHZ 20DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

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: -

Pulse Width Modulator with Fault Input (PWM)
15.3 Timebase
This section provides a discussion of the timebase.
15.3.1 Resolution
For edge-aligned mode, a 12-bit up-only counter is used to create the PWM period. Therefore, the PWM
resolution in edge-aligned mode is one clock (highest resolution is 125 ns @ BUSCLK = 8 MHz) as shown
144
$004A
$004B
$004C
$004D
$0045
$0046
$0047
$0048
$0049
Addr.
PWM Counter Modulo Register
PWM Counter Modulo Register
PWM Counter Register High
PWM Counter Register Low
PWM 0 Value Register High
PWM 1 Value Register High
PWM 0 Value Register Low
PWM 1 Value Register Low
(DISMAP)
Register Name
PWM Disable Mapping
Write Once Register
High (PMODH)
See page 153.
See page 153.
See page 154.
See page 154.
See page 154.
See page 155.
See page 154.
See page 155.
See page 158.
Low (PMODL)
(PVAL0H)
(PVAL1H)
(PVAL0L)
(PVAL1L)
(PCNTH)
(PCNTL)
Figure 15-3. Register Summary (Continued)
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Reset:
Read:
Read:
Read:
Read:
Read:
Read:
Read:
Read:
Read:
Write:
Write:
Write:
Write:
Write:
Write:
Write:
Write:
Write:
MC68HC908LB8 Data Sheet, Rev. 1
Bit 15
Bit 15
Bit 7
Bit 7
Bit 7
Bit 7
Bit 7
R
0
0
0
0
0
0
0
0
0
0
0
= Reserved
Bit 14
Bit 14
Bit 6
Bit 6
Bit 6
Bit 6
6
0
0
0
0
0
0
0
0
0
0
0
Bit 13
Bit 13
Bit 5
Bit 5
Bit 5
Bit 5
5
0
0
0
0
0
0
0
0
0
0
0
Indeterminate after reset
Bit 12
Bit 12
Bit 4
Bit 4
Bit 4
Bit 4
Bold
4
0
0
0
0
0
0
0
0
0
0
0
= Buffered
Bit 11
Bit 11
Bit 11
Bit 11
Bit 3
Bit 3
Bit 3
Bit 3
3
0
0
0
0
0
0
0
0
Indeterminate after reset
Bit 10
Bit 10
Bit 10
Bit 10
Bit 2
Bit 2
Bit 2
Bit 2
Freescale Semiconductor
2
0
0
0
0
0
0
0
0
MAP1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
Bit 9
Bit 1
1
0
0
0
0
0
0
1
MAP0
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
Bit 8
Bit 0
0
0
0
0
0
0
1