tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 99

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

RA002
Voltage detection interrupt
request signal
7.4 Register Settings
Detection voltage level
7.4.1 Setting procedure when the operation mode is set to generate voltage detection
7.4.2 Setting procedure when the operation mode is set to generate voltage detection
VDCR1<VDxSF>
VDD level
interrupt request signals
setting:
becomes equal to or higher than the detection voltage (VDxLVL).
reset signals
When the operation mode is set to generate voltage detection interrupt request signal, make the following
In this case, setting VDCR2<SRSS> allows STOP mode to be released when the supply voltage (VDD)
Note:If the set value of detection voltage (VDxLVL) is close to the supply voltage (VDD), voltage detection request
When the operation mode is set to generate voltage detection reset signals, make the following setting:
Note 1: VDCR1 and VDCR2 are initialized by a power-on reset or an external reset input only. If the supply voltage
1. Clear the voltage detection circuit interrupt enable flag to "0".
2. Set the detection voltage at VDCR1<VDxLVL>(x=1 to 2).
3. Clear VDCR2<VDxMOD> to "0" to set the operation mode to generate voltage detection interrupt
4. Set VDCR2<VDxEN> to "1" to enable the voltage detection operation.
5. Wait for 5 [us] or more until the voltage detection circuit becomes stable.
6. Make sure that VDCR1<VDxSF> is "0".
7. Clear the voltage detection circuit interrupt latch to "0" and set the interrupt enable flag to "1" to
1. Clear the voltage detection circuit interrupt enable flag to "0".
2. Set the detection voltage at VDCR1<VDxLVL>(x=1 to 2).
3. Clear VDCR2<VDxMOD> to "0" to set the operation mode to generate voltage detection interrupt
4. Set VDCR2<VDxEN> to "1" to enable the voltage detection operation.
5. Wait for 5 [us] or more until the voltage detection circuit becomes stable.
6. Make sure that VDCR1<VDxSF> is "0".
7. Set VDCR2<VDxMOD> to "1" to set the operation mode to generate voltage detection reset signals.
signals may be generated frequently. At the return from the voltage detection interrupt processing, execute
appropriate wait processing depending on fluctuations in the system power supply and clear the interrupt
latch.
NORMAL mode
request signals.
enable interrupts.
request signals.
(VDD) becomes lower than the detection voltage (VDxLVL) in the period from release of the voltage detec-
tion reset until clearing of VDCR2<VDxEN> to "0", a voltage detection reset signal is generated immedi-
ately.
Figure 7-4 STOP Mode Release by VDCR1<VDxSF>
STOP mode
STOP mode is
activated by
programming.
STOP mode is released at the falling
edge of VDCR1<VDxSF>
Warm-up
Page 85
NORMAL mode
STOP mode
STOP mode is
activated by
programming.
STOP mode is released at the falling
edge of VDCR1<VDxSF>
Warm-up
TMP89FM42
NORMAL mode