Rev. 1.00
46
August 29, 2018
Rev. 1.00
47
August 29, 2018
HT45F6530
AC Voltage Regulator Flash MCU
HT45F6530
AC Voltage Regulator Flash MCU
• RSTFC Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
LVRF
—
WRF
R/W
—
—
—
—
—
R/W
—
R/W
POR
—
—
—
—
—
x
—
0
“x”: unknown
Bit 7~3
Unimplemented, read as “0”
Bit 2
LVRF
: LVR function reset flag
Described elsewhere
Bit 1
Unimplemented, read as “0”
Bit 0
WRF
: WDTC register software reset flag
0: Not occurred
1: Occurred
This bit is set high by the WDTC register software reset and cleared by the application
program. Note that this bit can only be cleared to 0 by the application program.
Watchdog Timer Operation
The Watchdog Timer operates by providing a device reset when its timer overflows. This means
that in the application program and during normal operation the user has to strategically clear the
Watchdog Timer before it overflows to prevent the Watchdog Timer from executing a reset. This is
done using the clear watchdog instruction. If the program malfunctions for whatever reason, jumps
to an unknown location, or enters an endless loop, the clear instruction will not be executed in the
correct manner, in which case the Watchdog Timer will overflow and reset the device. There are five
bits, WE4~WE0, in the WDTC register to offer the enable/disable control and reset control of the
Watchdog Timer. The WDT function will be disabled when the WE4~WE0 bits are set to a value of
10101B while the WDT function will be enabled if the WE4~WE0 bits are equal to 01010B. If the
WE4~WE0 bits are set to any other values, other than 01010B and 10101B, it will reset the device
after a delay time, t
SRESET
. After power on these bits will have a value of 01010B.
WE4~WE0 Bits
WDT Function
10101B
Disable
01010B
Enable
Any other value
Reset MCU
Watchdog Timer Enable/Disable Control
Under normal program operation, a Watchdog Timer time-out will initialise a device reset and set
the status bit TO. However, if the system is in the SLEEP or IDLE Mode, when a Watchdog Timer
time-out occurs, the TO bit in the STATUS register will be set and only the Program Counter and
Stack Pointer will be reset. Three methods can be adopted to clear the contents of the Watchdog
Timer. The first is a WDTC register software reset, which means a certain value except 01010B and
10101B written into the WE4~WE0 bits, the second is using the Watchdog Timer software clear
instruction and the third is via a HALT instruction.
There is only one method of using software instruction to clear the Watchdog Timer. That is to use
the single “CLR WDT” instruction to clear the WDT.
The maximum time-out period is when the 2
15
division ratio is selected. As an example, with a
32kHz LIRC oscillator as its source clock, this will give a maximum watchdog period of around 1
second for the 2
15
division ratio, and a minimum timeout of 8ms for the 2
8
division ration.