HT9480 datasheet(4/57 Pages) HOLTEK

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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 software 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 software instructions.

1, 42,

52, 64

VSS

Negative power supply (GND)

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 “high” 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

35~38

COM3~COM0

Outputs for LCD panel common connections

TSC

µC test mode input pin, active low with pull-high resistor

Decoder test mode input pin, active low with a pull-high resistor

BAL

Battery low indication input, active high without pull-high

resistor

POCSAG code input serial data (inverting or non-inverting as

determined by SPF32). CMOS input without pull-high resistor

BS1

Pager receiver power control enable output, CMOS output

BS2

RF dc level adjustment pin, CMOS output

BS3

PLL control pin, CMOS output

FOUT

Frequency reference output pin

The FOUT output pin produces a 76.8kHz/153.6kHz signal with

a 1/2 duty cycle reference frequency if a 76.8kHz crystal is used.

HT9480

23th Feb ’98

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