HT46R63 Holtek Semiconductor Inc., HT46R63 Datasheet - Page 12

• Manufacturer Part Number: HT46R63
• Description: Ht46r63/ht46c63 -- A/d With Lcd Type 8-bit Mcu
• Manufacturer: Holtek Semiconductor Inc.

Oscillator Configuration
There are four oscillator circuits implemented in the
microcontroller.
Two of them are designed for system clocks, namely the
external RC oscillator and the crystal oscillator, which
are determined by options. The HALT mode stops the
system oscillator and resists the external signal to con-
serve power. Another one is a 32768Hz crystal oscilla-
tor, which only provides use for real time clock. The
other one is a built-in 12KHz RC oscillator, which is used
for WDTOSC.
If the system clock uses the external RC oscillator, an
external resistor between OSC1 and VDD is required
Note:
Rev. 2.30
Bit No.
Bit No.
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
The external resistor and capacitor components connected to the 32768Hz crystal are not necessary to pro-
vide oscillation. For applications where precise RTC frequencies are essential, these components may be re-
quired to provide frequency compensation due to different crystal manufacturing tolerances.
Label
Label
EADI
ERTI
EEI0
EEI1
EIF0
EIF1
ETBI
ADF
TBF
RTF
EMI
ETI
TF
Controls the master (global) interrupt (1= enabled; 0= disabled)
Controls the external interrupt 0 (1= enabled; 0= disabled)
Controls the external interrupt 1 (1= enabled; 0= disabled)
Controls the timer/event counter overflow interrupt (1= enabled; 0= disabled)
External interrupt 0 request flag (1= active; 0= inactive)
External interrupt 1 request flag (1= active; 0= inactive)
Timer/Event Counter overflow request flag (1= active; 0= inactive)
For test mode used only.
Must be written as 0 ; otherwise may result in unpredictable operation.
Controls the time base interrupt (1= enabled; 0= disabled)
Controls the A/D converter interrupt (1= enabled; 0= disabled)
Controls the real time clock interrupt (1= enabled; 0= disabled)
Unused bit, read as 0
Time base time-out interrupt 0 request flag (1= active; 0= inactive)
End of A/D conversion interrupt request flag (1= active; 0= inactive)
RTC time-out interrupt request flag (1= active; 0= inactive)
Unused bit, read as 0
INTC0 (0BH) Register
INTC1 (1EH) Register
System Oscillator
12
and the resistance should range from 24k to 1M . The
system clock, divided by 4, is available on OSC2, which
can be used to synchronize external logic.
If the system clock uses the crystal oscillator, a crystal
across OSC1 and OSC2 is needed to provide the feed-
back and phase shift required for the oscillator, and no
other external components are demanded. Instead of a
crystal, the resonator can also be connected between
OSC1 and OSC2 to get a frequency reference, but two
external capacitors in OSC1 and OSC2 are required.
If the RTCOSC is used, a crystal across OSC3 and
OSC4 is needed to provide the feedback and phase
shift required for the oscillator, and no other external
components are demanded.
Function
Function
HT46R63/HT46C63
March 22, 2006