HT48R065G View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT48R065G' PDF : 126 Pages View PDF
HT48R064G/065G/066G/0662G
Enhanced I/O Type 8-Bit OTP MCU with OPA
LXT Oscillator C1 and C2 Values
Crystal Frequency
C1
C2
32768Hz
10pF
10pF
Note: 1. C1 and C2 values are for guidance only.
2. RP=5M~10MW is recommended.
32768 Hz Crystal Recommended Capacitor Values
For the HT48R0662G device, a configuration option determines if the OSC3/OSC4 pins are used for
the LXT oscillator or as I/O pins.
· If the I/O option is selected then the OSC3/OSC4 pins can be used as normal I/O pins.
· If the LXT oscillator is selected, then the 32.768kHz crystal should be connected to the
OSC3/OSC4 pins.
LXT Oscillator Low Power Function
The LXT oscillator can function in one of two modes, the Quick Start Mode and the Low Power Mode.
The mode selection is executed using the LXTLP bit in the CTRL0 register.
LXTLP Bit
0
1
LXT Mode
Quick Start
Low-power
After power on the LXTLP bit will be automatically cleared to zero ensuring that the LXT oscillator
is in the Quick Start operating mode. In the Quick Start Mode the LXT oscillator will power up and
stabilise quickly. However, after the LXT oscillator has fully powered up it can be placed into the
Low-power mode by setting the LXTLP bit high. The oscillator will continue to run but with re-
duced current consumption, as the higher current consumption is only required during the LXT oscil-
lator start-up. In power sensitive applications, such as battery applications, where power
consumption must be kept to a minimum, it is therefore recommended that the application program
sets the LXTLP bit high about 2 seconds after power-on.
It should be noted that, no matter what condition the LXTLP bit is set to, the LXT oscillator will always
function normally, the only difference is that it will take more time to start up if in the Low-power
mode.
Internal Low Speed Oscillator - LIRC
The LIRC is a fully self-contained free running on-chip RC oscillator with a typical frequency of
13kHz at 5V requiring no external components. When the device enters the Idle/Sleep Mode, the
system clock will stop running but the LIRC oscillator continues to free-run and to keep the watchdog
active. However, to preserve power in certain applications the LIRC can be disabled via a
configuration option.
Rev. 1.10
40
October 23, 2012
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