68HC05PL4B datasheet(59/98 Pages) FREESCALE

59 / 98 page

April 30, 1998

GENERAL RELEASE SPECIFICATION

MC68HC05PL4

16-BIT PROGRAMMABLE TIMER

REV 2.0

9-9

OCIE - OUTPUT COMPARE INTERRUPT ENABLE

This read/write bit enables interrupts caused by an active signal on the TCMP

pin. Reset clears the OCIE bit.

1 = Output compare interrupts enabled.

0 = Output compare interrupts disabled.

TOIE - TIMER OVERFLOW INTERRUPT ENABLE

This read/write bit enables interrupts caused by a timer over o w. Reset clears

the TOIE bit.

1 = Timer over o w interrupts enabled.

0 = Timer over o w interrupts disabled.

IEDG - INPUT CAPTURE EDGE SELECT

The state of this read/write bit determines whether a positive or negative transi-

tion on the TCAP pin triggers a transfer of the contents of the timer register to

the input capture register. Resets have no effect on the IEDG bit.

1 = Positive edge (low to high transition) triggers input capture.

0 = Negative edge (high to low transition) triggers input capture.

OLVL - OUTPUT COMPARE OUTPUT LEVEL SELECT

The state of this read/write bit determines whether a logic one or a logic zero

appears on the TCMP when a successful output compare occurs. Resets clear

the OLVL bit.

1 = TCMP goes high on output compare.

0 = TCMP goes low on output compare.

9.5.1 Miscellaneous Control and Status Register for Timer16

The Miscellaneous Control and Status Register shown in Figure 9-11 performs

the following functions:

•

Con gure the I/O por t pin PA2 as input pin for TCAP signal

•

Con gure the I/O por t pin PA3 as output pin for TCMP signal

TCAPEN - TIMER INPUT CAPTURE ENABLE

The bit con gures por t pin PA2 for Timer16 input capture function (TCAP). At

power-on-reset, this bit is cleared, PA2 is a standard I/O port pin, TCAP to the

Timer16 is pulled high.

1 = PA2 pin con gured as TCAP for timer input capture

0 = PA2 pin as standard I/O port pin

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

MICSR

IRQEN

IRQS

TCMPEN TCAPEN

LED

COPON

POR

$001C

reset:

00000001

Figure 9-11. Miscellaneous Control and Status Register (MISCR)

Freescale Semiconductor, Inc.

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68HC05PL4B Datasheet(PDF) 59 Page - Freescale Semiconductor, Inc

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