HTG13J0 データシートの表示（PDF） - Holtek Semiconductor

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HTG13J0

4-Bit Microcontroller

Holtek Semiconductor 

An example of an LCD driving waveform (1/8

duty and 1/5 bias) is shown below.

512Hz

64Hz

1234567812345

VDD

4/5 VDD

COM0

3/5 VDD

2/5 VDD

1/5 VDD

GND

VDD

4/5 VDD

COM1

3/5 VDD

2/5 VDD

1/5 VDD

GND

SEG0

VDD

4/5 VDD

3/5 VDD

2/5 VDD

1/5 VDD

GND

Oscillator circuit

Only one external resistor is needed for HTG13J0

oscillator circuit.

The system clock is also used as the reference sig-

nal of LCD driving clock, sound effect clock, and

internal TIMER frequency source.

One HTG13J0 machine cycle consists of a se-

quence of 4 states numbered T1 to T4. Each state

lasts for one oscillator period. The machine cycle

is 4ms, if the system frequency is up to 1.0MHz.

Input ports PS, PP

All ports can have internal pull high resistors

VDD

pull-high

mask

option

wake-up

mask

option

wake-up

read control

internal bus

-

determined by mask option. Every bit of the in-

put ports PP and PS can be specified to be a

trigger source to wake up the HALT interrupt

by mask option. A high to low transition on one

of these pins will wake up the device from a

HALT status.

internal bus

DQ

CK Q

HT13J0

VDD

mask option

Output port - PA0~PA2

Output port PA0~PA2

A mask option is available to select whether the

output is a CMOS or open drain NMOS type.

After an initial clear, the output port PA de-

faults high for CMOS or floating for NMOS.

Note:

PA3 controls bit 13 of the program memory. Be

careful about PA3. When instruction "OUT PA,A"

is operated, port A is changed as well.

Mask option

The following options are available by mask op-

tion which must be selected prior to manufac-

turing.

· Each bit of input ports PS, PP with or without

pull-high resistor.

· Each bit of input ports PS, PP function as

HALT interrupt trigger.

· Each bit of output port PA0~PA2 with CMOS

or open drain NMOS.

· 8 bit programmable TIMER with internal fre-

quency sources. There are 13 (the sixth stage

is reserved for internal use) internal fre-

quency sources which can be selected as

clocking signal.

· Six kinds of sound clock frequency:

fSYS/2m, m=0, 1, 2, 3, 4, 5

13

May 19, 1999

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