68HC705JB3 datasheet(49/134 Pages) FREESCALE

49 / 134 page

November 5, 1998

GENERAL RELEASE SPECIFICATION

MC68HC05JB3

INPUT/OUTPUT PORTS

MOTOROLA

REV 1

7-3

7.1.5 PA0-PA7 Optical Interface

Port-A is programmable to use as ports for the optical interface.

See OPTICAL INTERFACE section for details.

7.2

PORT-B

Port-B is a 7-bit bi-directional port. The Port-B data register is at $0001 and the

data direction register (DDRB) is at $0005. Reset does not affect the data regis-

ters, but clears the data direction registers, thereby returning the port pins to

inputs. Writing a ‘one’ to a DDR bit sets the corresponding port bit to output mode.

PB4-PB7 are only available on the 28-pin version of the device.

All Port-B pins have programmable pull-down or pull-up resistors. PB1 and PB2

each has 25mA current sink capability.

PB0 is also used as the 16-timer TCAP input pin. When conﬁgured as output, the

input to the input capture will be permanently tied “low” and no input capture can

be generated.

The table below summarizes the pin conﬁgurations for Port-B.

7.2.1 Port-B Data Register

7.2.2 Port-B Data Direction Register

DDRBx — PBx Data Direction

1 =

Port pin set as output.

0 =

Port pin set as input.

PDRBx/PURBx

DDRBx

Pin Configuration

PB0, PB4-PB7: Input with pull-down

PB1, PB2: Input with pull-up

PB0, PB4-PB7: Output Push-Pull

PB1, PB2: Output Open-drain with pull-up

Input

PB0, PB4-PB7: Output Push-Pull

PB1, PB2: Output Open-drain

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

PORTB

PB7

PB6

PB5

PB4

PB2

PB1

PB0

$0001

reset:

00000000

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

DDRB

DDRB7

DDRB6

DDRB5

DDRB4

SLOWE

DDRB2

DDRB1

DDRB0

$0005

reset:

00000000

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

68HC705JB3 Datasheet(PDF) 49 Page - Freescale Semiconductor, Inc

68HC705JB3 Datasheet(HTML) 49 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL