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SmartBook for Renesas R8C/Tiny Microcontrollers

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Apart from VC27 of Voltage Detection Register 2, following bits play important

role when using this voltage detection circuit.

VC13: Voltage monitor flag of the register, Voltage Detection Register VCR1. This

bit indicates the status of supply voltage at Vcc pin. It becomes zero when the

supply voltage is less than Vdet and gets one level when the voltage rises to Vdet

or more.

This bit becomes valid only when VC27 is already set with the level 1.

In other words, only with the voltage detection circuit in enabled condition (by

VC27) then VC13 becomes valid. This VC27 has its own check point. Before

enabling voltage detection circuit, PRC3 bit of PRCR register (Protect Register)

should be set to one level.

D42 - Voltage Change Detection bit (of Voltage Detection Interrupt Register)

- 0: Not detected

- 1: Vdet pass detection.

D40 - Voltage Detection Interrupt Enable bit of D4INT.

- 0: Disable.

- 1: Enable.

D46 - Voltage monitor mode (bit of D4INT)

- 0: Voltage Detection Interrupt request when passing through Vdet.

- 1: Hardware Reset 2 when passing through Vdet.

2.15 Voltage Detection Interrupt:

A voltage detection interrupt is generated when the

supply Voltage at Vcc pin rises to Vdet or more

or drops below Vdet if the following conditions

are already initialized.

A voltage

detection interrupt

is generated when the

supply Voltage at Vcc pin rises

to Vdet or

more or

drops below

Vdet

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