HT48R10A-1 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT48R10A-1

I/O Type 8-Bit MCU

Holtek Semiconductor 

HT48R10A-1/HT48C10-1

The PC0 and PC1 are pin-shared with INT, TMR and

pins respectively.

In case of ²Internal RC+I/O² system oscillator, the PC3

and PC4 are pin-shared with OSC1 and OSC2 pins.

Once the ²Internal RC+I/O² mode is selected, the PC3

and PC4 can be used as general purpose I/O lines. Oth-

erwise, the pull-high resistors and I/O functions of PC3

and PC4 will be disabled.

It is recommended that unused or not bonded out I/O

lines should be set as output pins by software instruction

to avoid consuming power under input floating state.

Low Voltage Reset - LVR

The microcontroller provides low voltage reset circuit in

order to monitor the supply voltage of the device. If the

supply voltage of the device is within the range

0.9V~VLVR, such as changing a battery, the LVR will au-

tomatically reset the device internally.

The LVR includes the following specifications:

· The low voltage (0.9V~VLVR) has to remain in their

original state to exceed 1ms. If the low voltage state

does not exceed 1ms, the LVR will ignore it and do not

perform a reset function.

V DD

5 .5 V

· The LVR uses the ²OR² function with the external

RES signal to perform chip reset.

The relationship between VDD and VLVR is shown below.

V DD

V O PR

5 .5 V 5 .5 V

V LV R

3 .0 V

2 .2 V

0 .9 V

Note: VOPR is the voltage range for proper chip opera-

tion at 4MHz system clock.

V LV R

0 .9 V

0V

R e s e t S ig n a l

L V R D e te c t V o lta g e

R eset

N o r m a l O p e r a tio n

R eset

*1

*2

Low Voltage Reset

Note:

*1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system

clock pulses before entering the normal operation.

*2: Since the low voltage has to maintain in its original state and exceed 1ms, therefore 1ms delay enter the

reset mode.

Rev. 1.90

16

November 4, 2005

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