Rev. 1.00
34
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Rev. 1.00
35
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HT66FM5440
Brushless DC Motor A/D Flash MCU
HT66FM5440
Brushless DC Motor A/D Flash MCU
High Speed
Oscillator
LIRC
Low Speed
Oscillator
6-stage
Prescaler
HLCLK�
CKS�~CKS0 bits
f
H
f
H
/�
f
H
/4
f
H
/�
f
H
/16
f
H
/3�
f
H
/64
f
LIRC
f
SUB
f
SYS
HIRC
Time Base
Watchdog
Timer
f
TBC
f
SYS
/4
f
S
f
TB
TBCK
Device Clock Configurations
System Operation Modes
There are four different modes of operation for the microcontroller, each one with its own
special characteristics and which can be chosen according to the specific performance and
power requirements of the application. The NORMAL Mode allow
s
normal operation of the
microcontroller. The remaining three modes, the SLEEP, IDLE0 and IDLE
1
Mode are used when
the microcontroller CPU is switched off to conserve power.
Operating Mode
Description
CPU
f
SYS
f
SUB
f
S
f
TBC
NORMAL Mode
On
f
H
~f
H
/64
On
On
On
IDLE0 Mode
Off
Off
On
On
On
IDLE1 Mode
Off
On
On
On
On
SLEEP Mode
Off
Off
On
On
Off