PIC16F84A 18-pin Enhanced Flash/EEPROM 8-Bit MCU Data Sheet

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PIC16F84ATABLE 1-1PIC16F84A PINOUT DESCRIPTIONPin NameDIPNo.SOICNo.SSOPNo.I/O/PTypeBufferTypeDescriptionOSC1/CLKIN 16 16 18 I ST/CMOS (3) Oscillator crystal input/external clock source input.OSC2/CLKOUT 15 15 19 O — Oscillator crystal output. Connects to crystal or resonator incrystal oscillator mode. In RC mode, OSC2 pin outputsCLKOUT which has 1/4 the frequency of OSC1, anddenotes the instruction cycle rate.MCLR 4 4 4 I/P ST Master clear (reset) input/programming voltage input. Thispin is an active low reset to the device.PORTA is a bi-directional I/O port.RA0 17 17 19 I/O TTLRA1 18 18 20 I/O TTLRA2 1 1 1 I/O TTLRA3 2 2 2 I/O TTLRA4/T0CKI 3 3 3 I/O ST Can also be selected to be the clock input to the TMR0timer/counter. Output is open drain type.PORTB is a bi-directional I/O port. PORTB can be softwareprogrammed for internal weak pull-up on all inputs.RB0/INT 6 6 7 I/O TTL/ST (1) RB0/INT can also be selected as an external interruptpin.RB1 7 7 8 I/O TTLRB2 8 8 9 I/O TTLRB3 9 9 10 I/O TTLRB4 10 10 11 I/O TTL Interrupt on change pin.RB5 11 11 12 I/O TTL Interrupt on change pin.RB6 12 12 13 I/O TTL/ST (2) Interrupt on change pin. Serial programming clock.RB7 13 13 14 I/O TTL/ST (2) Interrupt on change pin. Serial programming data.VSS 5 5 5,6 P — Ground reference for logic and I/O pins.VDD 14 14 15,16 P — Positive supply for logic and I/O pins.Legend: I= input O = output I/O = Input/Output P = power— = Not used TTL = TTL input ST = Schmitt Trigger inputNote 1: This buffer is a Schmitt Trigger input when configured as the external interrupt.2: This buffer is a Schmitt Trigger input when used in serial programming mode.3: This buffer is a Schmitt Trigger input when configured in RC oscillator mode and a CMOS input otherwise.DS35007A-page 4 Preliminary © 1998 Microchip Technology Inc.
PIC16F84A2.0 MEMORY ORGANIZATIONThere are two memory blocks in the PIC16F84A.These are the program memory and the data memory.Each block has its own bus, so that access to eachblock can occur during the same oscillator cycle.The data memory can further be broken down into thegeneral purpose RAM and the Special FunctionRegisters (SFRs). The operation of the SFRs thatcontrol the “core” are described here. The SFRs usedto control the peripheral modules are described in thesection discussing each individual peripheral module.The data memory area also contains the dataEEPROM memory. This memory is not directly mappedinto the data memory, but is indirectly mapped. That is,an indirect address pointer specifies the address of thedata EEPROM memory to read/write. The 64 bytes ofdata EEPROM memory have the address range0h-3Fh. More details on the EEPROM memory can befound in Section 5.0.Additional information on device memory may be foundin the PICmicro Mid-Range Reference Manual,(DS33023).2.1 Program Memory OrganizationThe PIC16FXX has a 13-bit program counter capableof addressing an 8K x 14 program memory space.For the PIC16F84A, the first 1K x 14 (0000h-03FFh)are physically implemented (Figure 2-1). Accessing alocation above the physically implemented address willcause a wraparound. For example, for locations 20h,420h, 820h, C20h, 1020h, 1420h, 1820h, and 1C20hwill be the same instruction.The reset vector is at 0000h and the interrupt vector isat 0004h.FIGURE 2-1:PROGRAM MEMORY MAPAND STACK - PIC16F84APCCALL, RETURN13RETFIE, RETLWStack Level 1•User MemorySpaceStack Level 8Reset VectorPeripheral Interrupt Vector0000h0004h3FFh1FFFh© 1998 Microchip Technology Inc. Preliminary DS35007A-page 5
Page 1 and 2: MPIC16F84A18-pin Enhanced Flash/EEP
Page 3: PIC16F84A1.0 DEVICE OVERVIEWThis do
Page 7 and 8: PIC16F84A2.2.2 SPECIAL FUNCTION REG
Page 9 and 10: PIC16F84A2.2.2.2 OPTION_REG REGISTE
Page 11 and 12: PIC16F84A2.3 PCL and PCLATHThe prog
Page 13 and 14: PIC16F84A3.0 I/O PORTSSome pins for
Page 15 and 16: PIC16F84A3.2 PORTB and TRISB Regist
Page 17 and 18: PIC16F84A4.0 TIMER0 MODULEThe Timer
Page 19 and 20: PIC16F84A5.0 DATA EEPROM MEMORYThe
Page 21 and 22: PIC16F84A6.0 SPECIAL FEATURES OF TH
Page 23 and 24: PIC16F84A6.2.3 RC OSCILLATORFor tim
Page 25 and 26: PIC16F84A6.4 Power-on Reset (POR)A
Page 27 and 28: PIC16F84AFIGURE 6-9:TIME-OUT SEQUEN
Page 29 and 30: PIC16F84A6.8.1 INT INTERRUPTExterna
Page 31 and 32: PIC16F84A6.11 Power-down Mode (SLEE
Page 33 and 34: PIC16F84A7.0 INSTRUCTION SET SUMMAR
Page 35 and 36: PIC16F84A8.0 DEVELOPMENT SUPPORT8.1
Page 37 and 38: PIC16F84A8.10 MPLAB Integrated Deve
Page 39 and 40: © 1998 Microchip Technology Inc. P
Page 41 and 42: PIC16F84A9.0 ELECTRICAL CHARACTERIS
Page 43 and 44: PIC16F84A9.1 DC CHARACTERISTICS: PI
Page 45 and 46: PIC16F84A9.3 DC CHARACTERISTICS: PI
Page 47 and 48: PIC16F84A9.5 AC (Timing) Characteri
Page 49 and 50: PIC16F84A9.5.3 TIMING DIAGRAMS AND
Page 51 and 52: PIC16F84AFIGURE 9-5:RESET, WATCHDOG
Page 53 and 54: PIC16F84A10.0 DC & AC CHARACTERISTI
Page 55 and 56:
PIC16F84A11.0 PACKAGING INFORMATION
Page 57 and 58:
PIC16F84A11.3 K04-051 18-Lead Plast
Page 59 and 60:
PIC16F84AAPPENDIX A: REVISION HISTO
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PIC16F84ANOTES:© 1998 Microchip Te
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PIC16F84AINDEXAAbsolute Maximum Rat
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PIC16F84AON-LINE SUPPORTMicrochip p
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PIC16F84APIC16F84A PRODUCT IDENTIFI
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PIC16F84A 18-pin Enhanced Flash/EEPROM 8-Bit MCU Data Sheet

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