M16CSLASH29 datasheet(63/499 Pages) RENESAS

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5. Resets

page 39

Figure 5.5 VCR1 Register and VCR2 Register

VC13

Voltage Detection Register 1

SymbolAddressAfter Reset (2)

VCR1001916

000010002

Low voltage monitor flag (1)

Bit Symbol

b7b6b5b4b3b2b1b0

NOTES:

1. The VC13 bit is useful when the VC27 bit of VCR2 register is set to 1 (low voltage detection circuit enable).

The VC13 bit is always 1 (VCC≥ Vdet4) when the VC27 bit in the VCR2 register is set to 0 (low voltage

detection circuit disable).

2. This register does not change at software reset, watchdog timer reset and oscillation stop detection reset.

0:VCC < Vdet4

1:VCC ≥ Vdet4

0000

000

Reserved bit

Set to 0

Voltage Detection Register 2 (1)

SymbolAddressAfter Reset (5)

VCR2001A16

0016

Bit Name

Bit Symbol

b7b6b5b4b3b2b1b0

NOTES:

1. Write to this register after setting the PRC3 bit in the PRCR register to 1 (write enable).

2. Set the VC26 bit to 1 to use brown-out reset.

3. VC26 bit is disabled in stop mode. (The MCU is not reset even if the voltage input to Vcc pin becomes

lower than Vdet3.)

4. When the VC13 bit in the VCR1 register and D42 bit in the D4INT register are used or the D40 bit is set

to 1 (low voltage detection interrupt enable), set the VC27 bit to 1.

5. This register does not change at software reset, watchdog timer reset and oscillation stop detection

reset.

6. The detection circuit does not start operation until td(E-A) elapses after the VC26 bit or VC27 bit is set

to 1.

VC26

VC27

00000

Function

Reserved bitSet to 0

Reset level monitor bit

(2, 3, 6)

0: Disable reset level detection

circuit

1: Enable reset level detection

circuit

Low voltage monitor

bit (4, 6)

0: Disable low voltage

detection circuit

1: Enable low voltage

detection circuit

(b2-b0)

(b7-b4)

(b5-b0)

Function

Bit Name

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