tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 97

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA002
Figure 7-2 Voltage Detection Interrupt Request Signal and Voltage Detection Reset Signal
7.3.1 Enabling/disabling the voltage detection operation
7.3.2 Selecting the voltage detection operation mode
7.3.3 Selecting the detection voltage level
7.3.4 Voltage detection flag and voltage detection status flag
ation.
released.
(VDCR1<VDxMOD>="0") and VDCR2<VDxEN> is set to "1", a voltage detection interrupt request signal is
generated when the supply voltage (VDD) becomes lower than the detection voltage (VDxLVL).
MOD>="1") and VDCR2<VDxEN> is set to "1", a voltage detection reset signal is generated when the supply
voltage (VDD) becomes lower than the detection voltage (VDxLVL).
age detection reset signals are generated continuously, as long as the supply voltage (VDD) is lower than the
detection voltage (VDxLVL).
checked by reading VDCR1<VDxF> and VDCR1<VDxSF>.
(VDxLVL), VDCR1<VDxF> is set to "1" and is held in this state. VDCR1<VDxF> is not cleared to "0" when
the supply voltage (VDD) becomes equal to or higher than the detection voltage (VDxLVL).
To clear VDCR1<VDxF>, "0" must be written to it.
Setting VDCR2<VDxEN> to "1" enables the voltage detection operation. Setting it to "0" disables the oper-
VDCR2<VDxEN> is cleared to "0" immediately after a power-on reset or a reset by an external reset input is
Note:When the supply voltage (VDD) is lower than the detection voltage (VDxLVL), setting VDCR2<VDxEN> to "1"
If the voltage detection operation mode is set to generate voltage detection interrupt request signals
If the voltage detection operation mode is set to generate voltage detection reset signals (VDCR1<VDx-
VDCR1 and VDCR2 are initialized by a power-on reset or an external reset input only. Therefore, the volt-
Note:If the voltage detection mode is set to generate voltage detection interrupt request signals and the supply volt-
Select a detection voltage at VDCR1<VDxLVL>.
The magnitude relation between the supply voltage (VDD) and the detection voltage (VDxLVL) can be
If VDCR2<VDxEN> is set at "1", when the supply voltage (VDD) becomes lower than the detection voltage
When VDCR2<VDxEN> is cleared to "0" after VDCR1<VDxF> is set to "1", the previous state is still held.
generates a voltage detection interrupt request signal or a voltage detection reset signal at the time.
age (VDD) becomes lower than the detection voltage (VDxLVL) in the STOP, IDLE0 or SLEEP0 mode, a volt-
age detection interrupt request signal is generated after the operation mode is released and returned to
NORMAL or SLOW mode.
Voltage detection reset signal
Voltage detection interrupt
Detection voltage level
VDCR2<VDxEN>
request signal
VDD level
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TMP89FM42