M16CSLASH29 datasheet(62/499 Pages) RENESAS

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5. Resets

page 38

5.5 Voltage Detection Circuit

Note

VCC = 5 V is assumed in 5.5 Voltage Detection Circuit.

Voltage detection circuit in the M16C/29 Group, T-ver. and V-ver. cannot be used.

The voltage detection circuit has 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 MCU is reset if the reset level

detection circuit detects VCC is Vdet3 or below. Use bits VC27 and VC26 in the VCR2 register to determine

whether the individual circuit is enabled.

Use the reset level detection circuit for brown-out detection reset.

The low voltage detection circuit also monitors the voltage applied to the VCC pin. The low voltage detec-

tion circuit use the VC13 bit in the VCR1 register to detect VCC is above or below Vdet4. The low voltage

detection interrupt can be used in the voltage detection circuit.

Figure 5.4 Voltage Detection Circuit Block

b7 b6

VCR2 Register

RESET

CM10 Bit=1

(Stop Mode)

>Vdet3

>Vdet4

Noise Rejection

Low Voltage

Detect Signal

VCR1 Register

VC13 Bit

1 shot

Internal Reset Signal

(“L” active)

VCC

td(S-R)

Brown-out Detect Reset

(Hardware Reset 2

Release Wait Time)

Reset level

detection circuit

Low voltage

detection circuit

M16C/29 데이터시트(PDF) 62 Page - Renesas Technology Corp