HT45R37 datasheet(3/99 Pages) HOLTEK

3 / 99 page

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~PB5/AN5

I/O

Bidirectional 6-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.

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.

PD0/PWM0/RC8

PD1/PWM1/RC9

PD2/RC10~PD5/RC13

PD6/PINT/RC14

PD7/PCLK/RC15

I/O

RC8~RC15

Bidirectional 8-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 PDPU regis-

ter. The PWM outputs, PWM0 and PWM1, are pin shared with pins

PD0 and PD1, the function of which is chosen using the PWM reg-

isters. PD6 is pin-shared with the Peripheral Interrupt line, PINT.

PD7 is pin-shared with the Peripheral Clock line, PCLK. The C/R to

F converter inputs RC8~RC15 are shared with pins Pins

PD0~PD7 respectively.

RCOUT/IN

Capacitor or resistor connection pin to RC OSC/ Oscillation input.

RREF

Reference resistor connection pin

CREF

Reference capacitor connection pin

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.

HT45R37

Rev. 1.00

June 25, 2009

HT45R37 датащи(PDF) 3 Page - Holtek Semiconductor Inc

HT45R37 датащи(HTML) 3 Page - Holtek Semiconductor Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

датащи скачать

ссылки URL