MC68HC908MR8CP Freescale Semiconductor, MC68HC908MR8CP Datasheet - Page 146

• Manufacturer Part Number: MC68HC908MR8CP
• Description: IC MCU 8K FLASH 8MHZ PWM 28-DIP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908MR8CP

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 12
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -

Pulse-Width Modulator for Motor Control
9.4 Timebase
9.4.1 Resolution
Technical Data
146
This subsection provides for a discussion of the timebase.
In center-aligned mode, a 12-bit up/down counter is used to create the
PWM period. Therefore, the PWM resolution in center-aligned mode is
two clocks (highest resolution is 250 ns @ f
Figure
register to determine its maximum count. The PWM period will equal:
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 @ f
Figure
maximum count. The PWM period will equal:
Center-aligned operation versus edge-aligned operation is determined
by the option EDGE. See
Pulse-Width Modulator for Motor Control (PWMMC)
9-3. The up/down counter uses the value in the timer modulus
9-4. Again, the timer modulus register is used to determine the
(timer modulus) x (PWM clock period) x 2
(timer modulus) x (PWM clock period)
5.4 CONFIG
Bits.
OP
OP
= 8 MHz) as shown in
= 8 MHz) as shown in
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor