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

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PIC16F8X NOTES: DS30430C-page 114 © 1998 Microchip Technology Inc.
APPENDIX A: FEATURE IMPROVEMENTS - FROM PIC16C5X TO PIC16F8X The following is the list of feature improvements over the PIC16C5X microcontroller family: 1. Instruction word length is increased to 14 bits. This allows larger page sizes both in program memory (2K now as opposed to 512 before) and the register file (128 bytes now versus 32 bytes before). 2. A PC latch register (PCLATH) is added to handle program memory paging. PA2, PA1 and PA0 bits are removed from the status register and placed in the option register. 3. Data memory paging is redefined slightly. The STATUS register is modified. 4. Four new instructions have been added: RETURN, RETFIE, ADDLW, and SUBLW. Two instructions, TRIS and OPTION, are being phased out although they are kept for compatibility with PIC16C5X. 5. OPTION and TRIS registers are made 6. addressable. Interrupt capability is added. Interrupt vector is at 0004h. 7. Stack size is increased to 8 deep. 8. Reset vector is changed to 0000h. 9. Reset of all registers is revisited. Five different reset (and wake-up) types are recognized. Registers are reset differently. 10. Wake up from SLEEP through interrupt is added. 11. Two separate timers, the Oscillator Start-up Timer (OST) and Power-up Timer (PWRT), are included for more reliable power-up. These timers are invoked selectively to avoid unnecessary delays on power-up and wake-up. 12. PORTB has weak pull-ups and interrupt on change features. 13. T0CKI pin is also a port pin (RA4/T0CKI). 14. FSR is a full 8-bit register. 15. "In system programming" is made possible. The user can program PIC16CXX devices using only five pins: VDD, VSS, VPP, RB6 (clock) and RB7 (data in/out). PIC16F8X APPENDIX B: CODE COMPATIBILITY - FROM PIC16C5X TO PIC16F8X To convert code written for PIC16C5X to PIC16F8X, the user should take the following steps: 1. Remove any program memory page select operations (PA2, PA1, PA0 bits) for CALL, GOTO. 2. Revisit any computed jump operations (write to PC or add to PC, etc.) to make sure page bits are set properly under the new scheme. 3. Eliminate any data memory page switching. Redefine data variables for reallocation. 4. Verify all writes to STATUS, OPTION, and FSR registers since these have changed. 5. Change reset vector to 0000h. © 1998 Microchip Technology Inc. DS30430C-page 115
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Devices Included in this Data Sheet
Page 3 and 4:
1.0 GENERAL DESCRIPTION The PIC16F8
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2.0 PIC16F8X DEVICE VARIETIES A var
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3.0 ARCHITECTURAL OVERVIEW The high
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TABLE 3-1 PIC16F8X PINOUT DESCRIPTI
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4.0 MEMORY ORGANIZATION There are t
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FIGURE 4-1: REGISTER FILE MAP - PIC
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4.2.2.1 STATUS REGISTER The STATUS
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4.2.2.3 INTCON REGISTER The INTCON
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4.5 Indirect Addressing; INDF and F
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5.0 I/O PORTS The PIC16F8X has two
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5.2 PORTB and TRISB Registers PORTB
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5.3 I/O Programming Considerations
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6.0 TIMER0 MODULE AND TMR0 REGISTER
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6.2 Using TMR0 with External Clock
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6.3.1 SWITCHING PRESCALER ASSIGNMEN
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7.0 DATA EEPROM MEMORY The EEPROM d
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7.5 Write Verify Depending on the a
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8.0 SPECIAL FEATURES OF THE CPU Wha
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FIGURE 8-2: CONFIGURATION WORD - PI
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FIGURE 8-6: EXTERNAL SERIES RESONAN
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PIC16F8X TABLE 8-3 RESET CONDITION
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PIC16F8X FIGURE 8-10: TIME-OUT SEQU
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8.7 Time-out Sequence and Power-dow
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FIGURE 8-17: INT PIN INTERRUPT TIMI
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8.11 Watchdog Timer (WDT) The Watch
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8.12.3 WAKE-UP USING INTERRUPTS Whe
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9.0 INSTRUCTION SET SUMMARY Each PI
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9.1 Instruction Descriptions ADDLW
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BTFSS Bit Test f, Skip if Set Synta
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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: Package Type: K04-051 18-Lead Plast
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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