M32CSLASH8A datasheet(58/372 Pages) RENESAS

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M32C/8A Group

6. Power Supply Voltage Detection Function

Rev.1.00

Jul 15, 2007

Page 41 of 352

REJ09B0385-0100

6.1

Vdet3 Detection Function

The hardware reset 2 is performed if the voltage applied to the VCC1 pin drops to Vdet3 (V) or below.

Set the VC26 bit in the VCR2 register to 1 to use this Vdet3 detection function.

When the hardware reset 2 occurs, ports and I/O pins for peripheral functions are reset. The CPU and SFRs are

reset when td(S-R) elapses after the voltage applied to the VCC1 pin reaches Vdet3r (V) or above. Then, the MCU

executes a program in an address indicated by the reset vector. The states of pins and SFRs after reset are the same

as the hardware reset 1.

Use the Vdet3 detection function while operating at or above Vdet3s. If the applied voltage drops below Vdet3s,

perform the hardware reset 1 (refer to 5.1.1 Reset at a Stable Supply Voltage). The Vdet3 detection function

cannot be used while the MCU is in stop mode.

Figure 6.5 shows a Vdet3 detection function operation example.

Figure 6.5

Vdet3 Detection Function Operation Example

VSS

VCC1

RESET

Set to 1 (Vdet3 detection function used) by program.

NOTES:

1. Typical value.

2. Minimum value.

5.0 V

Vdet3r

Vdet3

Vdet3s

2.0V(2)

Undefined

VC26 bit in the

VCR2 register

Internal reset signal

3.0 V(1)

3.1 V(1)

“H”

“L”

“1”

“0”

“H”

“L”

Wait time to release

hardware reset 2: td(S-R)

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