HT45R36 Holtek Semiconductor, HT45R36 Datasheet - Page 16

• Manufacturer Part Number: HT45R36
• Description: C/R to F Type 8-Bit OTP MCU
• Manufacturer: Holtek Semiconductor

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External RC Oscillation Converter
An external RC oscillation mode is implemented in the
device. The RC oscillation converter contains two 16-bit
programmable count-up counters and the Timer A clock
source may come from the system clock or system
clock/4. The timer B clock source may come from the
external RC oscillator.
Rev. 1.00
Bit No.
Bit No.
0~2
2~3
4~7
3
4
5
6
7
0
1
RCOCON To enable or disable external RC oscillation converter counting (0= disabled; 1= enabled)
RCOM0
RCOM1
RCOM2
Label
Label
RCO
OVB
RW
Unused bit, read as 0
Undefined bit, this bit can read/write
To define the Timer A clock source, RCOM2, RCOM1, RCOM0=
000= System clock
001= System clock/4
010= Unused
011= Unused
100= Unused
101= Unused
110= Unused
111= Unused
In the RC oscillation converter mode, this bit is used to define the timer/event counter interrupt,
which comes from Timer A overflow or Timer B overflow.
(0= Timer A overflow; 1= Timer B overflow)
Define RC oscillation converter mode.
(0= Disable RC oscillation converter mode; 1= Enable RC oscillation converter mode)
Unused bit, read as 0
4-bit read/write registers for user defined.
External RC Oscillation Converter
RCOCCR (22H) Register
RCOCR (25H) Register
Timer/Event Counter
16
The RC oscillation converter is comprised of the
TMRAL, TMRAH, TMRBL, TMRBH registers when the
RCO bit, bit 1 of RCOCR register, is 1 . The RC oscilla-
tion converter Timer B clock source may come from an
external RC oscillator. The Timer A clock source comes
from the system clock or from the system clock/4, deter-
mined by the RCOCCR register.
Function
Function
September 28, 2006
HT45R36