M32C85 datasheet(73/542 Pages) RENESAS

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6. Voltage Detection Circuit

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6. Voltage Detection Circuit

The voltage detection circuit consists of the reset level detection circuit and the low voltage detection circuit.

The reset level detection circuit monitors the voltage applied to the VCC1 pin. The microcomputer is reset if

the reset level detection circuit detects VCC1 is Vdet3 or below. This circuit is disabled when the microcom-

puter is in stop mode.

The voltage detection circuit also monitors the voltage applied to the VCC1 pin. The low voltage detection

signal is generated when the low voltage detection circuit detects VCC1 is above or below Vdet4. This

signal generates the low voltage detection interrupt. The VC13 bit in the VCR1 register determines whether

VCC1 is above or below Vdet4.

The voltage detection circuit is available when VCC1=4.2V to 5.5V.

Figure 6.1 shows a block diagram of the voltage detection circuit.

The voltage detection circuit in M32C/85T cannot be used.

However, the cold start-up/warm start-up determine function is available.

NOTE

Figure 6.1 Voltage Detection Circuit Block Diagram

b7 b6

VCR2 Register

RESET

CM10 Bit=1

(Stop Mode)

≥Vdet3

≥Vdet4

Noise Rejection

Low Voltage

Detection Signal

VCR1 Register

VC13 Bit

1 shot

td(S-R)

Internal Reset Signal

("L" active)

Wait Time to Release

Brown-out Detection

Reset

VCC1

Low Voltage

Detection Circuit

Reset Level

Detection Circuit

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