
16-2
ML63326 User's Manual
Chapter 16 Battery Low Detect Circuit (BLD)
16.3 Judgment Voltage
The value of the judgment voltage is selected by the software by setting the LD1 (bit 1 of
BLDCON) and LD0 (bit 0 of BLDCON) bits.
Table 16-1 lists judgment voltage and precision values.
Table 16-1 Judgment Voltage
LD1
LD0
Judgment voltage (V)
Remarks
0
0
—
Undefined
0
1
2.00
Ta = 25°C
1
0
2.20
Ta = 25°C
1
1
2.40
Ta = 25°C
Precision (V)
—
±0.10
±0.10
±0.10
16.4 Battery Low Detect Circuit Register
•
Battery low detect control register (BLDCON)
BLDCON is a 4-bit special function register (SFR) that controls the battery low
detect circuit.
BLDF
ENBL
LD1
LD0
Judgment result flag
0: Higher than judgment value (initial value)
1: Lower than judgment value
BLDCON (094H)
(R/W)
bit 3
bit 2
bit 1
bit 0
Judgment voltage select
bit 1 bit 0
0 0 : Undefined (initial value)
0 1 : 2.00 ±0.10 V
1 0 : 2.20 ±0.10 V
1 1 : 2.40 ±0.10 V
Battery low detect circuit ON/OFF control
0: Battery low detect circuit OFF (initial value)
1: Battery low detect circuit ON
bit 3: BLDF
This flag indicates the judgement result of the battery low detect circuit.
This bit is set to "1" when V
DD
is lower than the judgment voltage selected by LD0
and LD1, and is set to "0" when V
DD
is higher. This bit is "0" when the BLD circuit
stops operation.
This bit is read-only and writes are invalid.
bit 2: ENBL
This bit turns the battery low detect circuit ON or OFF.
When ENBL is set to "1", the battery low detect circuit is ON. When ENBL is set
to "0", the battery low detect circuit is OFF.
At system reset, this bit is cleared to "0".
bit 1, 0: LD1, LD0
These bits select the judgment voltage.
At system reset, these bits are cleared to "0".
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