SPMCK16Z4MPV20 datasheet(388/500 Pages) FREESCALE

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M68HC16 Z SERIES

D-14

USER’S MANUAL

PIV[7:0] — Periodic Interrupt Vector

This field specifies the periodic interrupt vector number supplied by the SIM when the

CPU16 acknowledges an interrupt request.

D.2.14 Periodic Interrupt Timer Register

Contains the count value for the periodic timer. This register can be read or written at

any time.

PTP — Periodic Timer Prescaler

0 = Periodic timer clock not prescaled.

1 = Periodic timer clock prescaled by a value of 512.

PITM[7:0] — Periodic Interrupt Timing Modulus

This field determines the periodic interrupt rate. Use the following equations to calcu-

late timer period.

The following equation calculates the PIT period when a slow reference frequency is

used:

The following equation calculates the PIT period when a fast reference frequency is

used:

The following equation calculates the PIT period for an externally input clock frequen-

cy on both slow and fast reference frequency devices.

PITR — Periodic Interrupt Timer Register

$YFFA24

PTP

PITM[7:0]

RESET:

MODCLK

PIT Period

PITM[7:0]

() 1 if PTP = 0, 512 if PTP = 1

() 4

()

ref

---------------------------------------------------------------------------------------------------------------------

PIT Period

128

() PITM[7:0]

() 1 if PTP = 0, 512 if PTP = 1

() 4

()

ref

------------------------------------------------------------------------------------------------------------------------------------

PIT Period

PITM[7:0]

() 1 if PTP = 0, 512 if PTP = 1

() 4

()

sys

---------------------------------------------------------------------------------------------------------------------

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

SPMCK16Z4MPV20 Datasheet(PDF) 388 Page - Freescale Semiconductor, Inc

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