HC705P6AGRSSLASHD datasheet(72/134 Pages) NXP

Part #	HC705P6AGRS/D

Description	The Motorola MC68HC705P6A is an EPROM version of the MC68HC05P6 microcontroller

PDF	134 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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72 / 134 page

Capture/Compare Timer

General Release Specification

MC68HC705P6A — Rev. 1.0

Capture/Compare Timer

8.4.4 Alternate Timer Registers (ATRH and ATRL)

The alternate timer registers, shown in Figure 8-5, contain the current

high and low bytes of the 16-bit counter. Reading ATRH before reading

ATRL causes ATRL to be latched until ATRL is read. Reading ATRL has

no effect on the timer overflow flag (TOF). Writing to the alternate timer

registers has no effect.

Figure 8-5. Alternate Timer Registers (ATRH and ATRL)

NOTE:

To prevent interrupts from occurring between readings of ATRH and

ATRL, set the interrupt flag in the condition code register before reading

ATRH, and clear the flag after reading ATRL.

ATRH

$001A

Bit 7

Bit 0

Read:

BIT15

BIT14

BIT13

BIT12

BIT11

BIT10

BIT9

BIT8

Write:

Reset:

11111111

ATRL

$001B

Bit 7

Bit 0

Read:

BIT7

BIT6

BIT5

BIT4

BIT3

BIT2

BIT1

BIT0

Write:

Reset:

11111100

= Unimplemented

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC705P6AGRS/D Datasheet(PDF) 72 Page - NXP Semiconductors

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