HT48R10A-1 Просмотр технического описания (PDF) - Holtek Semiconductor

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HT48R10A-1

I/O Type 8-Bit MCU

Holtek Semiconductor 

HT48R10A-1/HT48C10-1

Pin Description

Pin Name I/O Options

Description

PA0~PA7

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

I/O

Wake-up

CMOS/Schmitt

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

or CMOS (dependent on options) input with a pull-high resistor (determined by

trigger Input pull-high options).

PB0/BZ

PB1/BZ

PB2~PB7

Bidirectional 8-bit input/output port. Software instructions determine the CMOS

output or Schmitt trigger input with a pull-high resistor (determined by pull-high

I/O

Pull-high*

I/O or BZ/BZ

options).

The PB0 and PB1 are pin-shared with the BZ and BZ, respectively. Once the PB0

and PB1 are selected as buzzer driving outputs, the output signals come from an

internal PFD generator (shared with timer/event counter).

VSS

¾

¾

Negative power supply, ground

PC0/INT

PC1/TMR I/O

PC2

Pull-high*

Bidirectional I/O lines. Software instructions determine the CMOS output or

Schmitt trigger input with a pull-high resistor (determined by pull-high options).

The external interrupt and timer input are pin-shared with the PC0 and PC1, re-

spectively. The external interrupt input is activated on a high to low transition.

RES

I

¾

Schmitt trigger reset input. Active low

VDD

¾

¾

Positive power supply

OSC1/PC3

OSC2/PC4

OSC1, OSC2 are connected to an RC network or Crystal (determined by options)

for the internal system clock. In the case of RC operation, OSC2 is the output ter-

I

O

Crystal or RC

or Int. RC+I/O

or Int. RC+RTC

minal for 1/4 system clock. These two pins also can be optioned as an RTC oscil-

lator (32768Hz) or I/O lines. In these two cases, the system clock comes from an

internal RC oscillator whose frequency has 4 options (3.2MHz, 1.6MHz, 800kHz,

400kHz). If the I/O option is selected, the pull-high options also be enabled. Oth-

erwise the PC3 and PC4 are used as internal registers (pull-high resistors always

disabled).

* The pull-high resistors of each I/O port (PA, PB, PC) are controlled by an option bit.

Absolute Maximum Ratings

Supply Voltage ...........................VSS-0.3V to VSS+6.0V

Input Voltage..............................VSS-0.3V to VDD+0.3V

Storage Temperature ............................-50°C to 125°C

Operating Temperature...........................-40°C to 85°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.

Rev. 1.90

3

November 4, 2005

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