BH66F2470 Datasheet, PDF (71/223 Pages) Holtek Semiconductor Inc – Glucose Meter Flash MCU

BH66F2470
Glucose Meter Flash MCU
LVR
Internal Reset
tRSTD + tSST
Low Voltage Reset Timing Chart
• 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 control
01010101: 2.1V
00110011: 2.55V
10011001: 3.15V
10101010: 3.8V
Any other value: Generates 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 the low voltage condition keeps more than a tLVR time. 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 a delay
time, tSRESET. However in this situation the register contents will be reset to the POR
value.
• RSTFC Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
—
—
RSTF LVRF
LRF
WRF
R/W
—
—
—
—
R/W
R/W
R/W
R/W
POR
—
—
—
—
0
x
0
0
Bit 7~4
Bit 3
Unimplemented, read as "0"
RSTF: Reset control register software reset flag
Refer to the RES Pin Reset section.
"x": unknown
Bit 2
Bit 1
Bit 0
LVRF: LVR function reset flag
0: Not occur
1: Occurred
This bit is set to 1 when a specific Low Voltage Reset situation condition occurs. This
bit can only be cleared to 0 by the application program.
LRF: LVR control register software reset flag
0: Not occur
1: Occurred
This bit is set to 1 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
0 by the application program.
WRF: WDT control register software reset flag
Refer to the Watchdog Timer Control Register section.
Rev. 1.00
71
March 15, 2017