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R8C/2G 数据表(PDF) 52 Page - Renesas Technology Corp |
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R8C/2G 数据表(HTML) 52 Page - Renesas Technology Corp |
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52 / 344 page  R8C/2G Group 6. Voltage Detection Circuit Rev.1.00 Apr 04, 2008 Page 32 of 318 REJ09B0387-0100 6. Voltage Detection Circuit The voltage detection circuit monitors the input voltage to the VCC pin. This circuit can be used to monitor the VCC input voltage by a program. Alternately, voltage monitor 0 reset, voltage monitor 1 interrupt, voltage monitor 1 reset, voltage monitor 2 interrupt, and voltage monitor 2 reset can also be used. Note that voltage monitor 1 and voltage monitor 2 share the voltage detection circuit with comparator 1 and comparator 2. Either voltage monitor 1 and voltage monitor 2 or comparator 1 and comparator 2 can be selected. Table 6.1 lists the Specifications of Voltage Detection Circuit and Figures 6.1 to 6.4 show the Block Diagrams. Figures 6.5 to 6.10 show the Associated Registers. Table 6.1 Specifications of Voltage Detection Circuit Item Voltage Detection 0 Voltage Detection 1 Voltage Detection 2 VCC Monitor Voltage to monitor Vdet0 Vdet1 Vdet2 Detection target Whether passing through Vdet0 by falling Passing through Vdet1 by rising or falling Passing through Vdet2 by rising or falling Monitor None VW1C3 bit in VW1C register VCA13 bit in VCA1 register Whether VCC is higher or lower than Vdet1 Whether VCC is higher or lower than Vdet2 Process When Voltage is Detected Reset Voltage monitor 0 reset Voltage monitor 1 reset Voltage monitor 2 reset Reset at Vdet0 > VCC; restart CPU operation at VCC > Vdet0 Reset at Vdet1 > VCC; restart CPU operation after a specified time Reset at Vdet2 > VCC; restart CPU operation after a specified time Interrupt None Voltage monitor 1 interrupt Voltage monitor 2 interrupt Interrupt request at both or either of Vdet1 > VCC and VCC > Vdet1 Interrupt request at both or either of Vdet2 > VCC and VCC > Vdet2 Digital Filter Switch enabled/disabled Available Available Available Sampling time (Divide-by-n of fOCO-S) × 4 n: 1, 2, 4, and 8 (Divide-by-n of fOCO-S) × 2 n: 1, 2, 4, and 8 (Divide-by-n of fOCO-S) × 2 n: 1, 2, 4, and 8 |
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