PIC16F8X, 18-Pin FLASH/EEPROM 8-Bit MCU Data Sheet - Microchip

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PIC16F8X 8.4 Power-on Reset (POR) A Power-on Reset pulse is generated on-chip when VDD rise is detected (in the range of 1.2V - 1.7V). To take advantage of the POR, just tie the MCLR pin directly (or through a resistor) to VDD. This will eliminate external RC components usually needed to create Power-on Reset. A minimum rise time for VDD must be met for this to operate properly. See Electrical Specifications for details. When the device starts normal operation (exits the reset condition), device operating parameters (voltage, frequency, temperature, ...) must be meet to ensure operation. If these conditions are not met, the device must be held in reset until the operating conditions are met. For additional information, refer to Application Note AN607, "Power-up Trouble Shooting." The POR circuit does not produce an internal reset when VDD declines. 8.5 Power-up Timer (PWRT) The Power-up Timer (PWRT) provides a fixed 72 ms nominal time-out (TPWRT) from POR (Figure 8-10, Figure 8-11, Figure 8-12 and Figure 8-13). The Power-up Timer operates on an internal RC oscillator. The chip is kept in reset as long as the PWRT is active. The PWRT delay allows the VDD to rise to an acceptable level (Possible exception shown in Figure 8-13). A configuration bit, PWRTE, can enable/disable the PWRT. See either Figure 8-1 or Figure 8-2 for the operation of the PWRTE bit for a particular device. The power-up time delay TPWRT will vary from chip to chip due to VDD, temperature, and process variation. See DC parameters for details. 8.6 Oscillator Start-up Timer (OST) The Oscillator Start-up Timer (OST) provides a 1024 oscillator cycle delay (from OSC1 input) after the PWRT delay ends (Figure 8-10, Figure 8-11, Figure 8-12 and Figure 8-13). This ensures the crystal oscillator or resonator has started and stabilized. The OST time-out (TOST) is invoked only for XT, LP and HS modes and only on Power-on Reset or wake-up from SLEEP. When VDD rises very slowly, it is possible that the TPWRT time-out and TOST time-out will expire before VDD has reached its final value. In this case (Figure 8-13), an external power-on reset circuit may be necessary (Figure 8-9). FIGURE 8-9: EXTERNAL POWER-ON RESET CIRCUIT (FOR SLOW VDD POWER-UP) Note 1: External Power-on Reset circuit is required only if VDD power-up rate is too slow. The diode D helps discharge the capacitor quickly when VDD powers down. 2: R < 40 kΩ is recommended to make sure that voltage drop across R does not exceed 0.2V (max leakage current spec on MCLR pin is 5 μA). A larger voltage drop will degrade VIH level on the MCLR pin. 3: R1 = 100Ω to 1 kΩ will limit any current flowing into MCLR from external capacitor C in the event of an MCLR pin breakdown due to ESD or EOS. DS30430C-page 44 © 1998 Microchip Technology Inc. VDD D VDD R C R1 MCLR PIC16FXX
PIC16F8X FIGURE 8-10: TIME-OUT SEQUENCE ON POWER-UP (MCLR NOT TIED TO VDD): CASE 1 VDD MCLR INTERNAL POR PWRT TIME-OUT OST TIME-OUT INTERNAL RESET TPWRT FIGURE 8-11: TIME-OUT SEQUENCE ON POWER-UP (MCLR NOT TIED TO VDD): CASE 2 VDD MCLR INTERNAL POR PWRT TIME-OUT OST TIME-OUT INTERNAL RESET TPWRT © 1998 Microchip Technology Inc. DS30430C-page 45 TOST TOST
Page 1 and 2: Devices Included in this Data Sheet
Page 3 and 4: 1.0 GENERAL DESCRIPTION The PIC16F8
Page 5 and 6: 2.0 PIC16F8X DEVICE VARIETIES A var
Page 7 and 8: 3.0 ARCHITECTURAL OVERVIEW The high
Page 9 and 10: TABLE 3-1 PIC16F8X PINOUT DESCRIPTI
Page 11 and 12: 4.0 MEMORY ORGANIZATION There are t
Page 13 and 14: FIGURE 4-1: REGISTER FILE MAP - PIC
Page 15 and 16: 4.2.2.1 STATUS REGISTER The STATUS
Page 17 and 18: 4.2.2.3 INTCON REGISTER The INTCON
Page 19 and 20: 4.5 Indirect Addressing; INDF and F
Page 21 and 22: 5.0 I/O PORTS The PIC16F8X has two
Page 23 and 24: 5.2 PORTB and TRISB Registers PORTB
Page 25 and 26: 5.3 I/O Programming Considerations
Page 27 and 28: 6.0 TIMER0 MODULE AND TMR0 REGISTER
Page 29 and 30: 6.2 Using TMR0 with External Clock
Page 31 and 32: 6.3.1 SWITCHING PRESCALER ASSIGNMEN
Page 33 and 34: 7.0 DATA EEPROM MEMORY The EEPROM d
Page 35 and 36: 7.5 Write Verify Depending on the a
Page 37 and 38: 8.0 SPECIAL FEATURES OF THE CPU Wha
Page 39 and 40: FIGURE 8-2: CONFIGURATION WORD - PI
Page 41 and 42: FIGURE 8-6: EXTERNAL SERIES RESONAN
Page 43: PIC16F8X TABLE 8-3 RESET CONDITION
Page 47 and 48: 8.7 Time-out Sequence and Power-dow
Page 49 and 50: FIGURE 8-17: INT PIN INTERRUPT TIMI
Page 51 and 52: 8.11 Watchdog Timer (WDT) The Watch
Page 53 and 54: 8.12.3 WAKE-UP USING INTERRUPTS Whe
Page 55 and 56: 9.0 INSTRUCTION SET SUMMARY Each PI
Page 57 and 58: 9.1 Instruction Descriptions ADDLW
Page 59 and 60: BTFSS Bit Test f, Skip if Set Synta
Page 61 and 62: COMF Complement f Syntax: [ label ]
Page 63 and 64: INCFSZ Increment f, Skip if 0 Synta
Page 65 and 66: NOP No Operation Syntax: [ label ]
Page 67 and 68: RLF Rotate Left f through Carry Syn
Page 69 and 70: SUBWF Subtract W from f Syntax: [ l
Page 71 and 72: 10.0 DEVELOPMENT SUPPORT 10.1 Devel
Page 73 and 74: MPASM has the following features to
Page 75 and 76: PIC16F83/84 PIC16F8X 11.0 ELECTRICA
Page 77 and 78: PIC16F83/84 PIC16F8X 11.1 DC CHARAC
Page 79 and 80: PIC16F83/84 PIC16F8X 11.3 DC CHARAC
Page 81 and 82: TABLE 11-2 TIMING PARAMETER SYMBOLO
Page 83 and 84: FIGURE 11-4: CLKOUT AND I/O TIMING
Page 85 and 86: FIGURE 11-6: TIMER0 CLOCK TIMINGS T
Page 87 and 88: PIC16CR83/84 PIC16F8X 12.0 ELECTRIC
Page 89 and 90: PIC16CR83/84 PIC16F8X 12.1 DC CHARA
Page 91 and 92: PIC16CR83/84 PIC16F8X 12.3 DC CHARA
Page 93 and 94: TABLE 12-2 TIMING PARAMETER SYMBOLO
Page 95 and 96:
FIGURE 12-4: CLKOUT AND I/O TIMING
Page 97 and 98:
FIGURE 12-6: TIMER0 CLOCK TIMINGS T
Page 99 and 100:
13.0 DC & AC CHARACTERISTICS GRAPHS
Page 101 and 102:
FIGURE 13-3: TYPICAL RC OSCILLATOR
Page 103 and 104:
FIGURE 13-8: VTH (INPUT THRESHOLD V
Page 105 and 106:
FIGURE 13-11: TYPICAL IDD vs. FREQU
Page 107 and 108:
FIGURE 13-13: WDT TIMER TIME-OUT PE
Page 109 and 110:
FIGURE 13-17: IOH vs. VOH, VDD = 3
Page 111 and 112:
14.0 PACKAGING INFORMATION 14.1 Pac
Page 113 and 114:
Package Type: K04-051 18-Lead Plast
Page 115 and 116:
APPENDIX A: FEATURE IMPROVEMENTS -
Page 117 and 118:
PIC16F8X APPENDIX E: CONVERSION CON
Page 119 and 120:
INDEX Numerics 8.1 Configuration Bi
Page 121 and 122:
ON-LINE SUPPORT Microchip provides
Page 123 and 124:
PIC16F8X PRODUCT IDENTIFICATION SYS
Page 125:
M AMERICAS Corporate Office 2355 We
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PIC16F8X, 18-Pin FLASH/EEPROM 8-Bit MCU Data Sheet - Microchip

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