HT9480 datasheet(3/47 Pages) HOLTEK

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Pin Assignment

Pin Description

Pin No

Pin Name

I/O

Function

43~49

PA0~PA6

7-bit input ports, with pull-high resistors

Each bit can be configured as a wake-up input by mask option.

54~61

PB0~PB7

I/O

Bidirectional 8-bit input/output ports, pull-high mask option

The output structures, whether tri-state or CMOS, are determined by soft-

ware instructions.

62~63

PC0~PC1

I/O

Bidirectional 2-bit input/output ports, pull-high mask option

The output structures, whether tri-state or CMOS, are determined by soft-

ware instructions.

1, 42,

52, 64

VSS

Negative power supply, ground

X1 and X2 are connected to an external crystal to form an internal low

power oscillator clock.

OSC1

OSC2

OSC1 and OSC2 are connected to an RC network or a crystal (determined

by mask option) to form the system clock oscillator. For RC operation,

OSC2 is the output terminal of the system clock.

RES

Schmitt trigger reset input, active low

BAF

Battery fail interrupt with debounce circuit input

TMR1

Schmitt trigger input for timer/event counter

2, 39, 51

VDD

Positive power supply

Buzzer non-inverting BZ output

The BZ pin outputs

²high² at buzzer off (by setting the value 00H of 1DH)

3~34

78~80

SEG31~SEG0

SEG34~SEG32

LCD driver outputs for LCD panel segments

HT9480

Rev. 1.20

July 31, 2002

2 1

4 0

6 0

6 1

8 0

2 0

4 1

V S S

V D D

S E G 3 1

S E G 3 0

S E G 2 9

S E G 2 8

S E G 2 7

S E G 2 6

S E G 2 5

S E G 2 4

S E G 2 3

S E G 2 2

S E G 2 1

S E G 2 0

S E G 1 9

S E G 1 8

S E G 1 7

S E G 1 6

S E G 1 5

S E G 1 4

P B 6

P B 5

P B 4

P B 3

P B 2

P B 1

P B 0

R E S

V S S

V D D

T M R 1

P A 6

P A 5

P A 4

P A 3

P A 2

P A 1

P A 0

V S S

O S C 2

H T 9 4 8 0

8 0 L Q . P - A

( 1 2 ´ 1 2 )

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