HTG12N0 datasheet(14/30 Pages) HOLTEK

14 / 30 page

Interfacing

The HTG12N0 microcontroller communicates

with the outside world through 7-bit input pins

PS and PM0~PM2 and 6-bit output pins PA and

PC2~PC3.

Input ports – PS, PM0~PM2

All of the ports can have internal pull high

resistors determined by mask option. Every bit

of the input ports PS and PM0~PM2 can be

specified to be a trigger source for waking 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.

Output port – PA, PC2~PC3

A mask option is available to select whether the

output is of a CMOS or open drain NMOS type.

After an initial clear the output port PA and

PC2~PC3 defaults to be high for CMOS or float-

ing for NMOS.

Mask options

HTG12N0 provides seven kinds of mask option

for different applications.

• Each bit of input ports PS, PM0~PM2 with

pull-high resistor

• Each bit of input ports PS, PM0~PM2 func-

tion as HALT wake-up trigger

• Each bit of output port PA, PC2~PC3 with

CMOS or open drain NMOS

• 8-bit programmable TIMER with internal or

external frequency sources. There are 14 in-

ternal frequency sources which can be se-

lected as a clocking signal.

If using internal frequency sources as clocking

signal TMCLK cannot connect with a pull-

high resistor.

• Six kinds of sound clock frequencies:

fSYS/2

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

• There are eight kinds of RTC interrupt fre-

quencies. RTC interrupt frequency=256/2

n Hz,

n=0~7.

• Three kinds of LCD bias current, 6µA, 15µA

and 60

µA for suitable size of LCD panel.

Input ports PS, PM0~PM2

Output port PA and PC2~PC3

HTG12N0

18th Mar ’99

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