R5F2L3ACBNFP datasheet(108/848 Pages) RENESAS

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6. Voltage Detection Circuit

REJ09B0441-0010 Rev.0.10

Jul 30, 2008

Page 72 of 809

Under development Preliminary specification

Specifications in this manual are tentative and subject to change.

R8C/L35A Group, R8C/L36A Group, R8C/L38A Group, R8C/L3AA Group,

R8C/L35B Group, R8C/L36B Group, R8C/L38B Group, R8C/L3AB Group

6.3

VCC Input Voltage

6.3.1

Monitoring Vdet0

Vdet0 cannot be monitored.

6.3.2

Monitoring Vdet1

Once the following settings are made, the comparison result of voltage monitor 1 can be monitored by the

VW1C3 bit in the VW1C register after td(E-A) has elapsed (refer to 36. Electrical Characteristics).

(1) Set bits VD1S3 to VD1S0 in the VD1LS register (voltage detection 1 detection voltage).

(2) Set the VCA21 bit in the VCA2 register to 0 (internal reference voltage).

(3) Set the VCA22 bit in the VCA2 register to 0 (VCC voltage).

(4) Set the VCA26 bit in the VCA2 register to 1 (voltage detection 1 circuit enabled).

6.3.3

Monitoring Vdet2

Once the following settings are made, the comparison result of voltage monitor 2 can be monitored by the

VCA13 bit in the VCA1 register after td(E-A) has elapsed (refer to 36. Electrical Characteristics).

(1) Set the VCA23 bit in the VCA2 register to 0 (internal reference voltage).

(2) Set the VCA24 bit in the VCA2 register to 0 (VCC voltage), or 1 (LVCMP2 pin input voltage).

(3) Set the VCA27 bit in the VCA2 register to 1 (voltage detection 2 circuit enabled).

R5F2L3ACBNFP Datasheet(PDF) 108 Page - Renesas Technology Corp