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HTG12N0

4-Bit Microcontroller

Holtek Semiconductor 

HTG12N0

Pad Description

Pad No. Pad Name I/O

Mask

Option

Description

38~99

1~2

SEG63~SEG2

SEG1~SEG0

O

—

LCD driver outputs for LCD panel segment

3

XIN

4

XOUT

I

O

—

32768Hz crystal oscillator for time base, LCD

clock

5

VDD

I

—

Positive power supply

6

OSCI

7

OSCO

I

O

—

An external resistor between OSCI and OSC0 is

needed for the internal system clock.

8

T512

O

29

T1D

O

17

TEST1

I

18

TEST2

I

For test mode only

TEST1 and TEST2 are left open when the chip is

in normal operation (with an internal pull-high

resistor).

9~16 COM7~COM0 O

—

Output for LCD panel common plate

22~25

21~19

PS3~PS0

PM2~PM0

I

Pull-high or

None, Note 2

Input pins for input only

26

VSS

I

—

Negative power supply, GND

27, 28 BZ, BZ

O

Note 1 Sound effect outputs

33~30

35~34

PA3~PA0

PC3~PC2

CMOS or

O NMOS Open Output latch pins for output only

Drain

36

RES

I

—

Input to reset an internal LSI

Reset is active on logical low level

37

TMCLK

I

Pull-high or

None, Note 3

Input for TIMER clock

TIMER can be clocked by an external clock or an

internal frequency source.

Notes:

1. The system clock provides six different sources selectable by mask option to drive the sound effect

clock. If the Holtek sound library is used, only 128K and 64K are acceptable.

2. Each bit of ports PM0~PM2, PS can be a trigger source of the HALT interrupt, selectable by mask

option.

3.14 internal clock sources can be selected by mask option to drive TMCLK. Note that TMCLK

should not be connected to a pull high resistor if an internal source is used.

5

18th Mar ’99

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