TMP86C993XB Toshiba, TMP86C993XB Datasheet - Page 81

• Manufacturer Part Number: TMP86C993XB
• Description: EMULATION CHIP FOR TMP86F SSOP
• Manufacturer: Toshiba

Specifications of TMP86C993XB

• Accessory Type: Adapter
• For Use With/related Products: TMP86F SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.4
7.4.1
Detection voltage level
VDCR2<VDxEN>
VDCR1<VDxSF>
VDCR1<VDxF>
Setting of register
Figure 7-3 Change of voltage detection flag and voltage detection status flag
causes the VDCR1<VDxF> flag to be set. This flag remains set until it is cleared by software. VDCR1<VDxF>
is not cleared to 0 when the supply voltage (VDD) becomes equal to or higher than the detection voltage
(VDxLVL).
VDCR1<VDxF> can only be cleared by writing a 0.
causes the VDCR1<VDxSF> flag to be set to 1. When VDD rises above VDxLVL, the VDCR1<VDxSF> flag
is cleared to 0.
cording to the relation between VDD and VDxLVL.
voltage condition.
Setting Procedure for Generate an interrupt
VDD level
When VDCR2<VDxEN>=1, a drop of the supply voltage (VDD) below the threshold voltage (VDxLVL)
Once VDCR1<VDxF> has been set to 1, this state is retained even if VDCR2<VDxEN> is cleared to 0.
When VDCR2<VDxEN>=1, a drop of the supply voltage (VDD) below the threshold voltage (VDxLVL) also
Unlike the VDCR1<VDxF> flag, the VDCR1<VDxSF> flag does not remain set and changes its state ac-
The following shows the setting procedure for generating an INTVLTD interrupt upon detection of a low-
Note:Depending on the voltage detect timing, the voltage detect status flag (VDCR1<VDxSF>) may be set
Note:If the selected threshold voltage (VDxLVL) is close to the supply voltage (VDD), INTVLTD interrupts may
1. Clear the INTVLTD interrupt enable flag <EF4> to 0.
2. Select the threshold voltage by programming the VDCR1<VDxLVL> (x=1, 2) bits.
3. Clear the VDCR2<VDxMOD> bit to 0 to generate an INTVLTD interrupt upon detection of a low-
4. Set the VDCR2<VDxEN> bit to 1 to enable voltage detect operation.
5. Wait for 5 us until the voltage detecting circuit stabilizes.
6. Ensure that the VDCR1<VDxSF> is 0.
7. Clear VDCR1<VDxF> to 0.
8. Clear the INTVLTD interrupt latch <IL4> to 0 and set the interrupt enable flag <EF4> to 1 to enable
one machine cycle before the voltage detect flag (VDCR1<VDxF>) is set.
voltage condition.
interrupts.
be generated frequently. After returning from the low-voltage detect interrupt routine, insert wait pro-
cessing as appropriate with consideration given to transitions in the system supply voltage before clearing
the interrupt latch.
VDCR2 because of "0" the flag is not set
Page 67
"0" the entry to VDCR1
TMP86FH92DMG