M32CSLASH86 datasheet(65/505 Pages) RENESAS

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Page 42

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 VCC pin. The microcomputer is reset if

the reset level detection circuit detects VCC 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 VCC pin. The low voltage detection

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

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

is above or below Vdet4.

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

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

The voltage detection circuit in M32C/86T 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

VCC

Low Voltage

Detection Circuit

Reset Level

Detection Circuit

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