HT45R37V datasheet(3/90 Pages) HOLTEK

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Pin Description

Pin Name

I/O

Configuration

Option

Description

PA0/BZ/RC0

PA1/BZ/RC1

PA2/TMR0/RC2

PA3/PFD/RC3

PA4/TMR1/SCS/RC4

PA5/SCK/SCL/RC5

PA6/INT0/SDI/SDA/RC6

PA7/INT1/SDO/RC7

I/O

SIM

BZ/BZ

PFD

RC0~RC7

Bidirectional 8-bit input/output port. Each individual bit on this port

can be configured as a wake-up input using the PAWU register.

Software instructions determine if the pin is a CMOS output or

Schmitt trigger input. A pull high resistor can be connected to each

pin using the PAPU register. Pins PA0, PA1, PA3, PA2, PA4, PA6

and PA7 are shared with BZ, BZ, PFD, TMR0, TMR1, INT0 and

INT1 respectively. PA7 is also pin-shared with the SPI bus data

output line, SDO. PA6 is also pin-shared with the SPI bus data line,

SDI and the I

2C Bus data line SDA. PA5 is also pin-shared with the

SPI bus clock line, SCK, and the I

2C Bus clock line SCL. PA4 is

also pin-shared with the SPI bus select line, SCS. The C/R to F

converter inputs RC0~RC7 are shared with pins Pins PA0~PA7

respectively.

PB0/AN0

PB1/AN1

I/O

Bidirectional 2-bit input/output port. Software instructions deter-

mine if the pin is a CMOS output or Schmitt trigger input. A pull

high resistor can be connected to each pin using the PBPU regis-

ter. PB is pin-shared with the A/D input pins. The A/D inputs are se-

lected via software instructions. Once selected as an A/D input,

the I/O function and pull-high resistor selections are disabled auto-

matically.

PB2/F1

PB3/STROBE

PB4/CLK

PB5/DATA

I/O

Bidirectional 4-bit internal input/output port. Software instructions

determine if the pin is a CMOS output or Schmitt trigger input. A

pull high resistor can be connected to each pin using the PBPU

PB2~PB5 are used to control the VFD driver interface by selected

as the I/O function. These pins should only be used as outputs and

as VFD interface pins and not as normal I/O pins.

PC0/RES

I/O

PC0 or RES

Bidirectional line I/O. Software instructions determine if the pin is

an NMOS output or Schmitt Trigger input. A configuration option

determines if the pin is to be used as a RES pin or as an I/O pin.

This pin does not have an internal pull-high function.

PC1/OSC1

PC2/OSC2

I/O

1.Int. RC OSC

2.Crystal OSC

3.Ext. RC OSC

Bidirectional 2-line I/O. Software instructions determine if the pins

are CMOS outputs or Schmitt Trigger inputs. A pull high resistor

can be connected to each pin using the PCPU register. Configura-

tion options determine if the pins are to be used as oscillator pins

or I/O pins. Configuration options also determine which oscillator

mode is selected. The three oscillator modes are:

1. Internal RC OSC: both pins configured as I/Os.

2. External crystal OSC: both pins configured as OSC1/OSC2.

3. External RC OSC+PC2: PC1 is configured as OSC1 pin, PC2

configured as an I/O.

If the internal RC OSC is selected, the frequency will be fixed at either

4MHz, 8MHz or 12MHz, dependent upon which configuration option

is chosen.

PC3/OSC3

PC4/OSC4

I/O

RTC OSC

Bidirectional 2-line I/O. Software instructions determine if the pins

are CMOS outputs or Schmitt Trigger inputs. A pull high resistor

can be connected to each pin using the PCPU register. Configura-

tion options determine if the pins are to be used as oscillator pins

or I/O pins. If configuration options select oscillator pins, the pins

are connected to a 32768Hz crystal oscillator.

HT45R37V

Rev. 1.00

October 20, 2009

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