HT48R502 datasheet(3/39 Pages) HOLTEK

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Pin Assignment

Pin Description

Pin Name

I/O

Options

Description

PA0~PA7

I/O

Wake-up

Pull-high*

CMOS or Schmitt

Input

Bidirectional 8-bit input/output ports

Each bit can be configured as a wake-up input by options. Software instruc-

tions determine the CMOS output or Schmitt trigger or CMOS input with or with-

out pull high resistor (by options).

PB0/BZ

PB1/BZ

PB2~PB7

I/O

Pull-high*

I/O or BZ/BZ

Bidirectional 8-bit input/output ports

Software instructions determine the CMOS output or Schmitt trigger input

(pull-high depends on options).

The PB0 and PB1 are pin-shared with the BZ and BZ, respectively. Once the

PB0 and PB1 are selected as buzzer driving outputs, the output signals come

from an internal PFD generator (shared with Timer/Event Counter 0).

VSS

¾¾

Negative power supply, ground

INT

External interrupt Schmitt trigger without pull high resistor

Edge trigger is activated during high to low transition.

TMR0

Schmitt trigger input for Timer/Event Counter 0

TMR1

Schmitt trigger input for Timer/Event Counter 1

PC0~PC7

I/O

Pull-high*

Bidirectional 8-bit input/output ports

Software instructions determine the CMOS output or Schmitt trigger input

(pull-high depends on options).

RES

Schmitt trigger reset input. Active low

VDD

¾¾

Positive power supply

HT48R502

Rev. 1.00

September 27, 2006

P B 6

P B 7

P A 4

P A 5

P A 6

P A 7

P F 0

P F 1

P F 2

P F 3

O S C 2

O S C 1

V D D

R E S

T M R 1

P D 3

P D 2

P D 1

P D 0

P C 7

P C 6

P C 5

P C 4

P C 3

P B 5

P B 4

P A 3

P A 2

P A 1

P A 0

P B 3

P B 2

P B 1 / B Z

P B 0 / B Z

P E 3

P E 2

P E 1

P E 0

P D 7

P D 6

P D 5

P D 4

V S S

I N T

T M R 0

P C 0

P C 1

P C 2

P A 7

P F 0

P F 1

P F 2

P F 3

O S C 2

O S C 1

P F 4

P F 5

P F 6

P F 7

V D D

R E S

T M R 1

P D 3

P D 2

P D 1

P D 0

P C 7

2 0 2 1 2 2 2 3 2 4

P A 1

P A 0

P E 7

P E 6

P E 5

P E 4

P B 3

P B 2

P B 1 / B Z

P B 0 / B Z

P E 3

P E 2

P E 1

P E 0

P D 7

P D 6

P D 5

P D 4

V S S

3 2

3 1

3 0

2 9

2 8

2 7

2 6

2 5

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

1 9

5 1

5 0

4 9

4 8

4 7

4 6

4 5

4 4

4 3

4 2

4 1

4 0

3 9

3 8

3 7

3 6

3 5

3 4

3 3

6 4 6 3 6 2 6 1 6 0

5 2

5 3

5 4

5 5

5 6

5 7

5 8

5 9

H T 4 8 R 5 0 2

4 8 S S O P - A

H T 4 8 R 5 0 2

6 4 Q F P - A

4 8

4 7

4 6

4 5

4 4

4 3

4 2

4 1

4 0

3 9

3 8

3 7

3 6

3 5

3 4

3 3

3 2

3 1

3 0

2 9

2 8

2 7

2 6

2 5

1 0

1 1

1 2

1 3

1 4

1 5

1 6

1 7

1 8

1 9

2 0

2 1

2 2

2 3

2 4

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