HT48R30A datasheet(3/43 Pages) HOLTEK

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Pin Assignment

Pin Description

Pin Name I/O

ROM Code

Option

Description

PA0~PA7

I/O

Pull-high*

Wake-up

CMOS/Schmitt

trigger Input

Bidirectional 8-bit input/output port. Each bit can be config-

ured as a wake-up input by ROM code option. Software instruc-

tions determine the CMOS output or Schmitt trigger or CMOS

input (depends on an options) with pull-high resistor (determined

by 1-bit pull-high options).

PB0/BZ

PB1/BZ

PB2~PB7

I/O

Pull-high*

PB0 or BZ

PB1 or BZ

Bidirectional 8-bit input/output port. Software instructions de-

termine the CMOS output or Schmitt trigger input with

pull-high resistor (determined by pull-high options).

The PB0 and PB1 are pin-shared with the BZ and BZ, respec-

tively. Once the PB0 or PB1 is selected as buzzer driving out-

puts, the output signals come from an internal PFD generator

(shared with timer/event counter).

VSS

¾¾

Negative power supply, ground

PG0/INT

I/O

Pull-high*

Bidirectional I/O lines. Software instructions determine the

CMOS output or Schmitt trigger input with pull-high resistor

(determined by 1-bit pull-high options). This external interrupt

input is pin-shared with PG0. The external interrupt input is

activated on a high to low transition.

PC0/TMR

PC1~PC5

I/O

Pull-high*

Bidirectional I/O lines. Software instructions determine the

CMOS output or Schmitt trigger input with pull-high resistor

(determined by 1-bit pull-high options). The timer input are

pin-shared with PC0.

HT48R30A-1

Rev. 1.10

July 2, 2001

PB 6

PB 7

PA 4

PA 5

PA 6

PA 7

OS C 2 / P G2

OS C 1 / P G1

VD D

RE S

PC 5

PC 4

PC 3

PC 2

PB 5

PB 4

PA 3

PA 2

PA 1

PA 0

PB 3

PB 2

PB 1 / BZ

PB 0 / BZ

VS S

PG 0 / I N T

PC 0 / T M R

PC 1

H T 4 8R 30A - 1

2 8 S K D I P - A / S O P - A

H T 4 8R 30A - 1

2 4 S K D I P - A / S O P - A

PB 6

PB 7

PA 4

PA 5

PA 6

PA 7

OS C 2 / P G2

OS C 1 / P G1

VD D

RE S

PC 2

PC 0 / T M R

PB 5

PB 4

PA 3

PA 2

PA 1

PA 0

PB 3

PB 2

PB 1 / BZ

PB 0 / BZ

VS S

P G 0 /IN T

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