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R5F2L3ACBNFP Datasheet(PDF) 96 Page - Renesas Technology Corp |
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R5F2L3ACBNFP Datasheet(HTML) 96 Page - Renesas Technology Corp |
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96 / 848 page  6. Voltage Detection Circuit REJ09B0441-0010 Rev.0.10 Jul 30, 2008 Page 60 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. Voltage Detection Circuit The voltage detection circuit monitors the voltage input to the VCC pin. This circuit can be used to monitor the VCC input voltage by a program. 6.1 Introduction The detection voltage of voltage detection 0 can be selected among four levels using the OFS register. The detection voltage of voltage detection 1 can be selected among 16 levels using the VD1LS register. As a detection target, the voltage input to VCC and the LVCMP2 pin can be switched for voltage detection 2 only. The voltage monitor 0 reset, and voltage monitor 1 interrupt and voltage monitor 2 interrupt can also be used. Note that voltage monitor 1 and voltage monitor 2 share the voltage detection circuit with comparator A1 and comparator A2. Either voltage monitor 1 and voltage monitor 2 or comparator A1 and comparator A2 can be selected. Table 6.1 Voltage Detection Circuit Specifications Item Voltage Monitor 0 Voltage Monitor 1 Voltage Monitor 2 VCC monitor Voltage to monitor Vdet0 Vdet1 Vdet2 Detection target Whether passing through Vdet0 by falling Whether passing through Vdet1 by rising or falling Whether passing through Vdet2 by rising or falling The input voltage to VCC and the LVCMP2 pin can be switched by the VCA24 bit in the VCA2 register. Detection voltage Selectable among 4 levels using the OFS register. Selectable among 16 levels using the VD1LS register. The detection voltage level varies depending on when VCC is selected or when LVCMP2 is selected. Each value is set as the fixed level. Monitor None The VW1C3 bit in the VW1C register The VCA13 bit in the VCA1 register Whether VCC is higher or lower than Vdet1 Whether VCC or LVCMP2 input voltage is higher or lower than Vdet2 Process at voltage detection Reset Voltage monitor 0 reset None None Reset at Vdet0 > VCC; CPU operation restarts at VCC > Vdet0 Interrupts None Voltage monitor 1 interrupt Voltage monitor 2 interrupt Non-maskable or maskable selectable Non-maskable or maskable selectable Interrupt request at: Vdet1 > VCC and/or VCC > Vdet1 Interrupt request at: Vdet2 > VCC (LVCMP2) and/or VCC (LVCMP2) > Vdet2 Digital filter Switching enable/disable Supported Supported Supported Sampling time (fOCO-S divided by n) × 4 n: 1, 2, 4, and 8 (fOCO-S divided by n) × 2 n: 1, 2, 4, and 8 (fOCO-S divided by n) × 2 n: 1, 2, 4, and 8 |
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