MC68HC908MR8CP Freescale Semiconductor, MC68HC908MR8CP Datasheet - Page 173

• 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: -

9.12.2 PWM Counter Modulo Registers
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
NOTE:
The PWM counter modulus registers (PDMODH and PDMODL) hold a
12-bit unsigned number that determines the maximum count for the
up/down or up-only counter. In center-aligned mode, the PWM period
will be twice the modulus (assuming no prescaler). In edge-aligned
mode, the PWM period will equal the modulus.
To avoid erroneous PWM periods, 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 this register, the value read is the buffer (not necessarily
the value the PWM generator is currently using).
Because of the equals-comparator architecture of this PWM, the
modulus = 0 case is considered illegal. Therefore, the modulus register
is not reset, and a modulus value of 0 will result in waveforms
inconsistent with the other modulus waveforms. If a modulus of 0 is
loaded, the counter will continually count down from $FFF. This
operation will not be tested or guaranteed. (The user should consider it
Reset:
Reset:
dress:
dress:
Read:
Read:
Write:
Write:
Pulse-Width Modulator for Motor Control (PWMMC)
Figure 9-31. PWM Counter Modulo Register High (PDMODH)
Ad-
Ad-
Figure 9-32. PWM Counter Modulo Register Low (PDMODL)
$0028
$0029
Bit 7
Bit 7
Bit 7
X
0
0
= Unimplemented X = Indeterminate
= Unimplemented X = Indeterminate
Bit 6
X
6
0
0
6
Bit 5
X
5
0
0
5
Pulse-Width Modulator for Motor Control (PWMMC)
Bit 4
X
4
0
0
4
Bit 11
Bit 3
X
X
3
3
Bit 10
Bit 2
X
X
2
2
Control Logic Block
Bit 9
Bit 1
X
X
1
1
Technical Data
Bit 0
Bit 8
Bit 0
Bit 0
X
X
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