HT46R12 datasheet(3/45 Pages) HOLTEK

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Pin Description

Pin Name

I/O

Options

Description

PA0~PA2

PA3/PFD

PA4/TMR0

PA5, PA6

PA7/TMR1

I/O

Pull-high

Wake-up

PA3 or PFD

Bidirectional 8-bit input/output port. Each bit can be configured as wake-up in-

put by options. Software instructions determine the CMOS output or Schmitt

trigger input with or without pull-high resistor (determined by pull-high options: bit

option). The PA3, PA4 and PA7 are pin-shared with PFD, TMR0 and TMR1 re-

spectively.

PB0/AN0

PB1/AN1

PB2/AN2

PB3/AN3

I/O

Pull-high

Bidirectional 4-bit input/output port. Software instructions determine the

CMOS output, Schmitt trigger input with or without pull-high resistor (deter-

mined by pull-high option: bit option) or A/D input.

Once a PB line is selected as an A/D input (by using software control), the I/O

function and pull-high resistor are disabled automatically.

PC0/C0VIN-

PC1/C0VIN+

PC2/C0OUT

PC3/C1OUT

C1VIN-

C1VIN+

I/O

Pull-high

I/O or

Comparator

Bidirectional 4-bit input/output port. Software instructions determine the

CMOS output, Schmitt trigger input with or without pull-high resistor (deter-

mine by pull-high option: port option).

PC0, PC1 and PC2 are pin-shared with C0VIN-, C0VIN+ and C0OUT respec-

tively. Once the Comparator 0 function is used, the internal registers related to

PC0, PC1 and PC2 cannot be used, and the I/O function and pull-high resistor

are disabled automatically. Software instructions determine the Comparator 0

function to be used.

C1VIN+ and C1VIN- are Comparator 1 input, C1OUT is pin-shared with PC3.

Once the Comparator 1 function is used, the internal registers related to PC3

cannot be used, and the I/O function and pull-high resistor are disabled auto-

matically. Software instructions determine the Comparator 1 function to be

used.

PPG

Programmable pulse generator output pin, the pin is floating when the power is

first turned on. The PPG0 output level (active low or active high) can be se-

lected via configuration option.

OSC1

OSC2

Crystal

or RC

OSC1, OSC2 are connected to an RC network or a Crystal (determined by op-

tions) for the internal system clock. In the case of RC operation, OSC2 is the

output terminal for 1/4 system clock.

RES

Schmitt trigger reset input. Active low.

VDD

¾¾

Positive power supply

VSS

¾¾

Negative power supply, ground.

Absolute Maximum Ratings

Supply Voltage ...........................VSS

-0.3V to VSS+6.0V

Storage Temperature ............................

-50°Cto125°C

Input Voltage..............................VSS

-0.3V to VDD+0.3V

Operating Temperature...........................

-40°Cto85°C

Note: These are stress ratings only. Stresses exceeding the range specified under

²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those

listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-

ity.

HT46R12

Rev. 1.00

November 1, 2005

HT46R12 Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

HT46R12 Datasheet(HTML) 3 Page - Holtek Semiconductor Inc

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