MC68332ACPV25 Freescale Semiconductor, MC68332ACPV25 Datasheet - Page 22

• Manufacturer Part Number: MC68332ACPV25
• Description: IC MCU 32-BIT 25MHZ A MASK
• Manufacturer: Freescale Semiconductor
• Series: M683xxr

Specifications of MC68332ACPV25

• Core Processor: CPU32
• Core Size: 32-Bit
• Speed: 25MHz
• Connectivity: EBI/EMI, SCI, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 15
• Program Memory Type: ROMless
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -
• Other names: Q1501580

PITR —Periodic Interrupt Timer Register
3.2.7 Periodic Interrupt Timer
PICR — Periodic Interrupt Control Register
PIRQL[2:0] — Periodic Interrupt Request Level
PIV[7:0] — Periodic Interrupt Vector
PTP — Periodic Timer Prescaler Control
PITM[7:0] — Periodic Interrupt Timing Modulus Field
22
RESET:
MOTOROLA
RESET:
15
0
0
15
0
0
The periodic interrupt timer (PIT) generates interrupts of specified priorities at specified intervals. Timing
for the PIT is provided by a programmable prescaler driven by the system clock.
This register contains information concerning periodic interrupt priority and vectoring. Bits [10:0] can be
read or written at any time. Bits [15:11] are unimplemented and always return zero.
The following table shows what interrupt request level is asserted when a periodic interrupt is generat-
ed. If a PIT interrupt and an external IRQ signal of the same priority occur simultaneously, the PIT in-
terrupt is serviced first. The periodic timer continues to run when the interrupt is disabled.
The bits of this field contain the vector generated in response to an interrupt from the periodic timer.
When the SIM responds, the periodic interrupt vector is placed on the bus.
The PITR contains the count value for the periodic timer. A zero value turns off the periodic timer. This
register can be read or written at any time.
The reset state of PTP is the complement of the state of the MODCLK signal during reset.
This is an 8-bit timing modulus. The period of the timer can be calculated as follows:
0 = Periodic timer clock not prescaled
1 = Periodic timer clock prescaled by a value of 512
where
14
0
0
14
0
0
PIT Period = Periodic interrupt timer period
PITM = Periodic interrupt timer register modulus (PITR[7:0])
EXTAL Frequency = Crystal frequency
Prescale = 512 or 1 depending on the state of the PTP bit in the PITR
13
0
0
13
0
0
12
0
0
12
0
0
Freescale Semiconductor, Inc.
11
0
0
11
For More Information On This Product,
0
0
PIT Period = [(PITM)(Prescaler)(4)]/EXTAL
PIRQL
10
0
0
10
000
001
010
011
100
101
110
111
0
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PIRQL
9
0
0
0
Periodic Interrupt Disabled
MODCLK
Interrupt Request Level 1
Interrupt Request Level 2
Interrupt Request Level 3
Interrupt Request Level 4
Interrupt Request Level 5
Interrupt Request Level 6
Interrupt Request Level 7
Interrupt Request Level
PTP
8
0
8
7
0
7
0
0
0
0
0
0
0
PIV
PITM
1
0
1
0
MC68332TS/D
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MC68332
0
0
1
0
0