TMP89FS60 datasheet(95/410 Pages) TOSHIBA

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Page 81

TMP89FS60

RA002

7. Voltage Detection Circuit

The voltage detection circuit detects any decrease in the supply voltage and generates voltage detection interrupt

request signals and voltage detection reset signals.

Note: The voltage detection circuit may operate improperly, depending on fluctuations in the supply voltage (VDD). Refer

to the electrical characteristics and take them into consideration when designing equipment.

7.1

Configuration

The voltage detection circuit consists of a reference voltage generation circuit, a detection voltage level selection

circuit, a comparator and control registers.

The supply voltage (VDD) is divided by the ladder resistor and input to the detection voltage selection circuit. A

voltage is selected in the detection voltage selection circuit, depending on the detection voltage (VDxLVL), and

compared to the reference voltage in the comparator. When the supply voltage (VDD) becomes lower than the detec-

tion voltage (VDxLVL), a voltage detection interrupt request signal or a voltage detection reset signal is generated.

Either the voltage detection interrupt request signal or the voltage detection reset signal can be selected by pro-

gramming the software.

Figure 7-1 Voltage Detection Circuit

7.2

Control

The voltage detection circuit is controlled by voltage detection control registers 1,2 and 3.

Voltage detection control register 1

VDCR1

(0x0FC6)

76543

210

Bit Symbol

VD2F

VD2SF

VD2LVL

VD1F

VD1SF

VD1LVL

Read/Write

R/W

Read Only

R/W

Read Only

R/W

After reset

00000

000

VDD

VDCR2

VDCR1

F/F

Voltage detection reset signal 1

Voltage detection reset signal 2

Voltage detection interrupt

request signal

F/F

Voltage detection STOP mode

release signal

Reference voltage

generation circuit

Interrupt request signal

generation circuit

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