PIC16C55X, EPROM-Based 8-Bit CMOS MCU Data Sheet

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PIC16C55XNOTES:DS40143C-page 22 Preliminary © 1998 Microchip Technology Inc.
PIC16C55X5.0 I/O PORTSThe PIC16C55X have two ports, PORTA and PORTB.5.1 PORTA and TRISA RegistersPORTA is a 5-bit wide latch. RA4 is a Schmitt Trigger inputand an open drain output. Port RA4 is multiplexed with theT0CKI clock input. All other RA port pins have SchmittTrigger input levels and full CMOS output drivers. All pinshave data direction bits (TRIS registers) which can configurethese pins as input or output.A '1' in the TRISA register puts the corresponding outputdriver in a hi- impedance mode. A '0' in the TRISA registerputs the contents of the output latch on the selected pin(s).Reading the PORTA register reads the status of the pins,whereas writing to it will write to the port latch. All writeoperations are read-modify-write operations. So a writeto a port implies that the port pins are first read, then thisvalue is modified and written to the port data latch.Note:On reset, the TRISA register is set to all inputs.FIGURE 5-2:DatabusWRPORTAWRTRISARD PORTADCKBLOCK DIAGRAM OF RA4 PINData LatchDCKQQQQTRISA LatchRD TRISAQSchmittTriggerinputbufferDENNVSSVSSI/O pin (1)FIGURE 5-1:BLOCK DIAGRAM OFPORT PINS RATMR0 clock inputDatabusDQWRPortACKQVDDPVDDData LatchDQNI/O pinWRTRISACK QTRIS LatchVSSSchmittTriggerinputbufferVSSRD TRISAQDENRD PORTA© 1998 Microchip Technology Inc. Preliminary DS40143C-page 23
Page 4 and 5: PIC16C55XNOTES:DS40143C-page 4 Prel
Page 6 and 7: PIC16C55XTABLE 1-1:PIC16C55X FAMILY
Page 8 and 9: PIC16C55XNOTES:DS40143C-page 8 Prel
Page 10: PIC16C55XFIGURE 3-1: BLOCK DIAGRAMD
Page 15: PIC16C55X4.2.2 SPECIAL FUNCTION REG
Page 18 and 19: PIC16C55X4.2.2.3 INTCON REGISTERThe
Page 20 and 21: PIC16C55X4.3 PCL and PCLATHThe prog
Page 24 and 25: PIC16C55XTABLE 5-1:PORTA FUNCTIONSN
Page 26 and 27: PIC16C55XFIGURE 5-4:BLOCK DIAGRAM O
Page 28 and 29: PIC16C55XNOTES:DS40143C-page 28 Pre
Page 30 and 31: PIC16C55XFIGURE 6-3: TIMER0 TIMING:
Page 32 and 33: PIC16C55X6.3 PrescalerAn 8-bit coun
Page 36 and 37: PIC16C55X7.1 Configuration BitsThe
Page 38 and 39: PIC16C55X7.2.3 EXTERNAL CRYSTAL OSC
Page 40 and 41: PIC16C55X7.4 Power-on Reset (POR),
Page 42 and 43: PIC16C55XTABLE 7-5:INITIALIZATION C
Page 44 and 45: PIC16C55XFIGURE 7-11:EXTERNAL POWER
Page 46 and 47: PIC16C55X7.5.1 RB0/INT INTERRUPTAn
Page 48 and 49: PIC16C55XFIGURE 7-14:WATCHDOG TIMER
Page 50 and 51: PIC16C55X7.9 Code ProtectionIf the
Page 52 and 53: PIC16C55XTABLE 8-2:Mnemonic,Operand
Page 54 and 55: PIC16C55XBCFBit Clear fSyntax: [ la
Page 56 and 57: PIC16C55XCLRWDTSyntax:Operands:Oper
Page 58 and 59: PIC16C55XIORWFInclusive OR W with f
Page 60 and 61: PIC16C55XRETURN Return from Subrout
Page 62 and 63: PIC16C55XSWAPFSwap Nibbles in fSynt
Page 64 and 65: PIC16C55X9.6 SIMICE Entry-Level Har
Page 66 and 67: PIC16C55X9.16 KEELOQ ® Evaluation
Page 70 and 71: PIC16C55XTABLE 10-1:CROSS REFERENCE
Page 72 and 73:
PIC16C55X10.2 DC CHARACTERISTICS: P
Page 74 and 75:
PIC16C55X10.3 DC CHARACTERISTICS: P
Page 76 and 77:
PIC16C55X10.5 Timing Diagrams and S
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PIC16C55XFIGURE 10-4:RESET, WATCHDO
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PIC16C55XNOTES:DS40143C-page 80 Pre
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PIC16C55XPackage Type:K04-010 18-Le
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PIC16C55XPackage Type:K04-051 18-Le
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PIC16C55XPrescaler ................
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PIC16C55XREADER RESPONSEIt is our i
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