MCU复位振荡电路应用-

1、MCU HA0075s / / / 1. L S- R S-C S- C P- 2. 乥LC 乥L=L S C=C S C P/(C S+C P3. 乥 / / 1. R INB 2. C IN1 C IN2 / Pierce / EMI3. R EXB C EX1R EXB C EX1 2f SYS MCU 4. C EX1 C EX2 乥 / HOLTEK MCUdatasheet handbook 5./ Warm-up 噝 / (Warm-up 噝 / ( 35msstart-up噝 噝 1024 EMI/EMS(EMC 乍噝 / MCU 噝 EMI / VDD GND(VSS 噝C

2、EX1 C EX2 VDD GND(VSS MCUVDD GND(VSS RC RC 1. R OSC C OSC RC 乥 乥 乥2.RC C OSC R OSC RC C S 乥 470pF3.4. OSC2 Rf SYS/4 2k start-up噝 噝 1024 噝 RC 乥 MCU 乥 25%噝 乫MCU( 乥 HOLTEK EMI/EMS(EMC 乍噝R OSC OSC1 OSC1 噝C S 催 MCU OSC1 GND 噝R PU 乥 f SYS/4乥 OSC1 RC RC 1. R OSC C OSC RC 乥 乥 乥2.RC C OSC R OSC RC C S 乥 470p

3、F3.4. OSC2 Rf SYS/4 2k start-up噝 噝 1024 噝 RC 乥 MCU 乥 25%噝 乫MCU( 乥 HOLTEK EMI/EMS(EMC 乍噝R OSC OSC1 OSC1 噝C S 催 MCU OSC1 VDD 噝R PU 乥 f SYS/4乥 OSC1RTC (32768Hz RTC(32768Hz RTC(32768Hz 1. L S- R S-C S- C P- 2. 乥LC 乥L=L S C=C S C P/(C S+C P3.RTC(32768Hz MCU RTC(32768Hz RTC(32768Hz 1. R INB 10M2. C IN3 C

4、IN4 / Pierce / EMI3. R EXB 4. C EX3 C EX4 乥 12pFMCU 32768Hz 32768Hz 0.20.3 RTC RTC RTC EMI/EMS(EMC RTC EMI RTC(32768Hz 32768Hz ppm CEX3 CEX3 1 EEPROM CEX3 CEX4 12pF( CEX4 12pF( 12pF( CEX4 CEXT4 RTC MCU EEPROM MCU MCU MCU VDD GND MCU , 23 EMI MCU 1 6 MCU RES MCU 0000H WDT RAM WDT (TO PDF I/O RC V D D

5、 M C U R C R E S R E S R E S R e s e t L V R a n d P O R RRES CRES MCU MCU CRES RRES CRES 100k 0.1 F CRES MCU RES VSS RC V D D M C U V D D R C R E S R N C N R E S L V R R e s e t a n d P O R R E S RC RRES CRES MCU RRES CRES RN 100k CN CN 0.1 F 10k 0.01 MCU F RRES VDD CRES 1/10 MCU CRES RES 7 MCU V D

6、 D V D D M C U R B 1 M C U R Q 1 R E S R e s e t L V R a n d P O R C B 1 R D Z B 3 Q 1 R C R E S R e s e t L V R a n d P O R R B 2 R RB1 RB1 RB3 Q1 PCB RB2 10k RB2 (RB1+RB2/(2 VZ+0.5V RB1 RB1 RC VZ RC RB2/30 100k Q1 (C (E MCU RES VDD IC V D D V D D M C U M C U R H T 7 0 X X A -1 C R E S V D D R R E S R E S R E S R e s e t L V R a n d P O R H T 7 0 X X A -1 C R N C N R E S R e s e t L V R a n d P O R R E S IC RC RRES CRES( CRES RN CN RC RC CN( RC RC RC RC PCB RC POR MCU (LVR POR TO POR LVR MCU PDF POR VDD ( 1ms LVR RC 0 MCU MCU (POR RES RES 8 MCU RC (WDT WDT RC WDT RC RC ( A WDT WDT MCU WD