MC68HC908AB32CFU Freescale Semiconductor, MC68HC908AB32CFU Datasheet - Page 226

• Manufacturer Part Number: MC68HC908AB32CFU
• Description: IC MCU 8MHZ 32K FLASH 64-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908AB32CFU

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: POR, PWM
• Number Of I /o: 51
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Programmable Interrupt Timer (PIT)
Technical Data
226
NOTE:
NOTE:
POF — PIT Overflow Flag Bit
POIE — PIT Overflow Interrupt Enable Bit
PSTOP — PIT Stop Bit
Do not set the PSTOP bit before entering wait mode if the PIT is required
to exit wait mode.
PRST — PIT Reset Bit
Setting the PSTOP and PRST bits simultaneously stops the PIT counter
at a value of $0000.
This read/write flag is set when the PIT counter resets to $0000 after
reaching the modulo value programmed in the PIT counter modulo
registers. Clear POF by reading the PIT status and control register
when POF is set and then writing a logic zero to POF. If another PIT
overflow occurs before the clearing sequence is complete, then
writing logic zero to POF has no effect. Therefore, a POF interrupt
request cannot be lost due to inadvertent clearing of POF. Reset
clears the POF bit. Writing a logic one to POF has no effect.
This read/write bit enables PIT overflow interrupts when the POF bit
becomes set. Reset clears the POIE bit.
This read/write bit stops the PIT counter. Counting resumes when
PSTOP is cleared. Reset sets the PSTOP bit, stopping the PIT
counter until software clears the PSTOP bit.
Setting this write-only bit resets the PIT counter and the PIT prescaler.
Setting PRST has no effect on any other registers. Counting resumes
from $0000. PRST is cleared automatically after the PIT counter is
reset and always reads as logic zero. Reset clears the PRST bit.
1 = PIT counter has reached modulo value
0 = PIT counter has not reached modulo value
1 = PIT overflow interrupts enabled
0 = PIT overflow interrupts disabled
1 = PIT counter stopped
0 = PIT counter active
1 = Prescaler and PIT counter cleared
0 = No effect
Programmable Interrupt Timer (PIT)
MC68HC908AB32
Freescale Semiconductor
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Rev. 1.1