HT45F3230 Datasheet, PDF (47/148 Pages) Holtek Semiconductor Inc – IR Sensing/Motor Driving Flash MCU

HT45F3230
IR Sensing/Motor Driving Flash MCU
• LVRC Register
Bit
Name
R/W
POR
7
LVS7
R/W
0
6
LVS6
R/W
1
5
LVS5
R/W
0
4
LVS4
R/W
1
3
LVS3
R/W
0
2
LVS2
R/W
1
1
LVS1
R/W
0
0
LVS0
R/W
1
Bit 7~0
LVS7~LVS0: LVR voltage select
01010101: 2.1V
00110011: 2.55V
10011001: 3.15V
10101010: 3.8V
Other values: MCU reset – register is reset to POR value
When an actual low voltage condition occurs, as specified by one of the four defined
LVR voltage values above, an MCU reset will be generated. The reset operation will
be activated after 2~3 fLIRC clock cycles. In this situation the register contents will
remain the same after such a reset occurs.
Any register value, other than the four defined LVR values above, will also result in
the generation of an MCU reset. The reset operation will be activated after 2~3 fLIRC
clock cycles. However in this situation the register contents will be reset to the POR
value.
• CTRL Register
Bit
Name
R/W
POR
Bit 7
Bit 6~3
Bit 2
Bit 1
Bit 0
7
6
5
4
3
2
1
0
FSYSON —
—
—
—
LVRF
LRF
WRF
R/W
—
—
—
—
R/W
R/W
R/W
0
—
—
—
—
x
0
0
“x” unknown
FSYSON: fSYS Control in IDLE Mode
Described elsewhere.
Unimplemented, read as “0”
LVRF: LVR function reset flag
0: Not occur
1: Occurred
This bit is set high when a specific Low Voltage Reset situation condition occurs. This
bit can only be cleared to zero by the application program.
LRF: LVR Control register software reset flag
0: Not occur
1: Occurred
This bit is set high if the LVRC register contains any non-defined LVR voltage register
values. This in effect acts like a software-reset function. This bit can only be cleared to
zero by the application program.
WRF: WDT Control register software reset flag
Described elsewhere.
Watchdog Time-out Reset during Normal Operation
The Watchdog time-out Reset during normal operation is the same as LVR reset except that the
Watchdog time-out flag TO will be set high.
WDT Time-out
Internal Reset
tRSTD + tSST
WDT Time-out Reset during Normal Operation Timing Chart
Rev. 1.00
47
January 13, 2017