HT48R10A-1_09 HOLTEK [Holtek Semiconductor Inc], HT48R10A-1_09 Datasheet - Page 16

• Manufacturer Part Number: HT48R10A-1_09
• Description: I/O Type 8-Bit MCU
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

The PC0 and PC1 are pin-shared with INT, TMR and
pins respectively.
In case of Internal RC+I/O system oscillator, the PC3
and PC4 are pin-shared with OSC1 and OSC2 pins.
Once the Internal RC+I/O 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~V
tomatically reset the device internally.
The LVR includes the following specifications:
Note:
Rev. 2.01
The low voltage (0.9V~V
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.
LVR
*1: To make sure that the system oscillator has stabilized, the SST provides an extra delay of 1024 system
*2: Since the low voltage has to maintain in its original state and exceed 1ms, therefore 1ms delay enter the
, such as changing a battery, the LVR will au-
clock pulses before entering the normal operation.
reset mode.
LVR
) has to remain in their
Low Voltage Reset
16
The relationship between V
Note:
The LVR uses the OR function with the external
RES signal to perform chip reset.
V
tion at 4MHz system clock.
OPR
is the voltage range for proper chip opera-
HT48R10A-1/HT48C10-1
DD
and V
LVR
January 9, 2009
is shown below.