MC68HC908MR8CP Freescale Semiconductor, MC68HC908MR8CP Datasheet - Page 174

• 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
9.12.3 PWMx Value Registers
Technical Data
174
NOTE:
illegal.) However, the dead-time constraints and fault conditions will still
be guaranteed.
Each of the six PWMs has a 16-bit PWM value register.
Reset:
Reset:
The 16-bit signed value stored in this register determines the duty cycle
of the PWM. The duty cycle is defined as: (PWM value/modulus) x 100.
Writing a number less than or equal to 0 causes the PWM to be off for
the entire PWM period. Writing a number greater than or equal to the
12-bit modulus causes the PWM to be on for the entire PWM period.
If the complementary mode is selected, the PWM pairs share PWM
value registers.
To avoid erroneous PWM pulses, this value is buffered and will not be
used by the PWM generator until the LDOK bit has been set and the next
PWM load cycle begins.
When reading these registers, the value read is the buffer (not
necessarily the value the PWM generator is currently using).
Read:
Read:
Write:
Write:
Pulse-Width Modulator for Motor Control (PWMMC)
Figure 9-33. PWMx Value Registers High (PVALxH)
Bit 15
Figure 9-34. PWMx Value Registers Low (PVALxL)
Bit 7
Bit 7
Bit 7
0
0
Bit 14
Bit 6
6
0
6
0
Bit 13
Bit 5
5
0
5
0
Bit 12
Bit 4
4
0
4
0
Bit 11
Bit 3
3
0
3
0
MC68HC908MR8 — Rev 4.1
Bit 10
Bit 2
Freescale Semiconductor
2
0
2
0
Bit 9
Bit 1
1
0
1
0
Bit 0
Bit 8
Bit 0
Bit 0
0
0