Rev. 1.00
36
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HT66FM5440
Brushless DC Motor A/D Flash MCU
HT66FM5440
Brushless DC Motor A/D Flash MCU
Bit 3
LTO
: Low speed oscillator ready flag
0: Not ready
1: Ready
This is the low speed system oscillator ready flag which indicates when the low speed
oscillator is stable after power on reset or a wake-up has occurred.
Bit 2
HTO
: High speed system oscillator ready flag
0: Not ready
1: Ready
This is the high speed system oscillator ready flag which indicates when the high speed
system oscillator is stable. This flag is cleared to "0" by hardware when the device is
powered on and then changes to a high level after the high speed system oscillator is
stable. Therefore this flag will always be read as "1" by the application program after
device power-on.
Bit 1
IDLEN
: IDLE Mode Control
0: Disable
1: Enable
This is the IDLE Mode Control bit and determines what happens when the HALT
instruction is executed. If this bit is high, when a HALT instruction is executed the
device will enter the IDLE Mode. In the IDLE1 Mode the CPU will stop running
but the system clock will continue to keep the peripheral functions operational, if
FSYSON bit is high. If FSYSON bit is low, the CPU and the system clock will all stop
in IDLE0 mode. If the bit is low the device will enter the SLEEP Mode when a HALT
instruction is executed.
Bit 0
HLCLK
: System Clock Selection
0: f
H
/2 ~ f
H
/64
1: f
H
This bit is used to select if the f
H
clock or the f
H
/2 ~ f
H
/64 clock is used as the system
clock. When the bit is high the f
H
clock will be selected and if low the f
H
/2 ~ f
H
/64
clock will be selected.
CTRL Register
Bit
7
6
5
4
3
2
1
0
Name
FSYSON
—
—
—
—
LVRF
LRF
WRF
R/W
R/W
—
—
—
—
R/W
R/W
R/W
POR
0
—
—
—
—
x
0
0
"x" �nknown
Bit 7
FSYSON
: f
SYS
Control in IDLE Mode
0: Disable
1: Enable
Bit 6~3
Unimplemented, read as "0"
Bit 2
LVRF
: LVR function reset flag
Describe elsewhere
Bit 1
LRF
: LVR control register software reset flag
Described elsewhere
Bit 0
WRF
: WDT Control register software reset flag
Describe elsewhere