M16C User Manual.pdf

Appendix 4Mitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTERAppendix 4 A practical example of connecting to the reset ICM62015 and M62016 are reset ICs compatible with the M16C's backup mode. Here follow these ICs'overview and characteristics together with an example of connecting to the M16C when Vcc = 3 V.• Overview of the reset ICsEither M62015 or M62016 detects the rising edge of the power, the falling edge, and abnormal voltage ofthe power of the 3-V family of microcomputer systems. It is an optimal semiconductor integrated circuit toreset or release the microcomputer system.Either M62015 or M61016 carries out 2-step power voltage detection, and is provided with two outputterminals (the forced reset signal output RESET and the interrupt handling signal output INT). EitherM62015 or M62016 embeds the BiCMOS process and the low power consumption circuit, and outputsoptimal signals from respective output terminals with low power consumption especially in dealing with asystem that requires its RAM backup.• Characteristics of the reset ICs* BiCMOS process low-consumption circuit configurationCircuit current Icc = 3 µA (standard value normal mode Vcc = 3.0 V)Icc = 3 µA (standard value backup mode Vcc = 2.5 V)* Two-step power voltage detectionNormal power detectionVs = 2.7 V (standard value)Power detection for backup VBATT = 2.0 V (standard value)* Two outputs____________Forced reset signal output RESET______Interrupt handling signal output INT* Output formCMOS output: M62015Open drain output: M62016• A practical example of connectionPower supplyVCC(+3V)Power for backupVBATT(+3V)Smoothingcapacity100µF+VCCINTNoteINTInterrupthandlingsignalVCCPowerterminalINTInterrupt inputDelaycapacity0.33µFCd+-+-RESETReset ICM62015 / M62016Note: Pull-up resistors are necessary only for open drain output form.RESETForced resetsignalRESETReset inputClock signalinput/outputM16C/62 group601