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R8C2K Datasheet(PDF) 51 Page - Renesas Technology Corp |
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R8C2K Datasheet(HTML) 51 Page - Renesas Technology Corp |
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51 / 471 page  R8C/2K Group, R8C/2L Group 6. Voltage Detection Circuit Rev.1.10 Dec 21, 2007 Page 34 of 450 REJ09B0406-0110 Figure 6.3 Block Diagram of Voltage Monitor 1 Interrupt/Reset Generation Circuit Figure 6.4 Block Diagram of Voltage Monitor 2 Interrupt/Reset Generation Circuit + - 1/2 1/2 1/2 Voltage detection 1 circuit VCA26 VCC Internal reference voltage VW1C3 Noise filter (Filter width: 200 ns) Voltage detection 1 signal is held “H” when VCA26 bit is set to 0 (disabled) Voltage detection 1 signal Digital filter fOCO-S VW1F1 to VW1F0 = 00b = 01b = 10b = 11b VW1C2 bit is set to 0 (not detected) by writing 0 by a program. When VCA26 bit is set to 0 (voltage detection 1 circuit disabled), VW1C2 bit is set to 0 Voltage monitor 1 interrupt/reset generation circuit VW1C0 to VW1C3, VW1F0, VW1F1, VW1C6, VW1C7: Bits in VW1C register VCA26: Bit in VCA2 register VW1C1 VW1C1 VW1C2 VW1C7 VW1C0 VW1C6 Non-maskable interrupt signal Voltage monitor 1 interrupt signal Watchdog timer interrupt signal Oscillation stop detection interrupt signal Voltage monitor 1 reset signal + - 1/2 1/2 1/2 Voltage detection 2 circuit VCA27 VCC Internal reference voltage VCA13 Noise filter (Filter width: 200 ns) Voltage detection 2 signal is held “H” when VCA27 bit is set to 0 (disabled) Voltage detection 2 signal Digital filter fOCO-S VW2F1 to VW2F0 = 00b = 01b = 10b = 11b VW2C2 bit is set to 0 (not detected) by writing 0 by a program. When VCA27 bit is set to 0 (voltage detection 2 circuit disabled), VW2C2 bit is set to 0 VW2C3 Watchdog timer block Watchdog timer underflow signal This bit is set to 0 (not detected) by writing 0 by a program. Voltage monitor 2 interrupt/reset generation circuit VW2C0 to VW2C3, VW2F0, VW2F1, VW2C6, VW2C7: Bits in VW2C register VCA13: Bit in VCA1 register VCA27: Bit in VCA2 register VW2C1 VW2C1 VW2C2 VW2C7 VW2C0 VW2C6 Non-maskable interrupt signal Voltage monitor 2 interrupt signal Watchdog timer interrupt signal Oscillation stop detection interrupt signal Voltage monitor 2 reset signal |
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