HC705J2 datasheet(18/78 Pages) MOTOROLA

Part #	HC705J2

Description	M68HC05 FAMILY OF 8 BIT MICROCONTROLLER UNITS

PDF	78 Pages

Scroll/Zoom	100%

Manufacturer	MOTOROLA [Motorola, Inc]

Direct Link	http://www.freescale.com

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18 / 78 page

MC68HC705J2

PARALLEL I/O

MOTOROLA

3-3

3.2 Port A

Port A is an 8-bit general-purpose bidirectional I/O port. The contents of DDRA

determine whether each pin is an input or an output. Figures 3-2 and 3-3 show

the port A data register and DDRA.

PORTA — Port A Data Register

$0000

Bit 7

654321

Bit 0

PA7

PA6

PA5

PA4

PA3

PA2

PA1

PA0

RESET:

NOT CHANGED BY RESET

Figure 3-2. Port A Data Register

PA7–PA0 — Port A Data Bits

These read/write bits are software-programmable.

Data direction of each bit is

under the control of the corresponding DDRA bit.

DDRA — Port A Data Direction Register

$0004

Bit 7

654321

Bit 0

DDRA5

DDRA4

DDRA3

DDRA2

DDRA1

DDRA0

RESET:

00000000

Figure 3-3. Port A Data Direction Register

DDRA7–DDRA0 — Port A Data Direction Bits

These read/write bits control port A data direction.

1 = Corresponding port A pin configured as output

0 = Corresponding port A pin configured as input

HC705J2 Datasheet(PDF) 18 Page - Motorola, Inc

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