Rainbow-electronics W78C54 User Manual

W78C548-BIT MICROCONTROLLERPublication Release Date: December 1997 - 1 - Revision A2GENERAL DESCRIPTIONThe W78C54 is a derivative of the W78C52 mic

W78C54- 10 -Following tables show the interrupt informations and priority definitions.Eight-source interrupt informations:INTERRUPTSOURCEVECTORADDRESS

W78C54Publication Release Date: December 1997- 11 - Revision A2TR1: Timer 1 run control bit. Set/cleared by software to turn timer/counter on or off.T

W78C54- 12 -ABSOLUTE MAXIMUM RATINGSPARAMETER SYMBOL MIN. MAX. UNITDC Power Supply VCC−VSS -0.3 +7.0 VInput Voltage VIN VSS -0.3 VCC +0.3 VOperating T

W78C54Publication Release Date: December 1997- 13 - Revision A2DC Characteristics, continuedPARAMETER SYM. SPECIFICATION UNIT TEST CONDITIONSMIN. MAX

W78C54- 14 -Clock Input WaveformTTXTAL1FCHCLOP, TCPContinuedPARAMETER SYMBOL MIN. TYP. MAX. UNIT NOTESOperating Speed FOP 0 - 40 MHz 1Clock Period TCP

W78C54Publication Release Date: December 1997- 15 - Revision A2Data Read CycleExternal Data Memory Read Cycle (see Figure 7)PARAMETER SYMBOL MIN. TYP.

W78C54- 2 -PIN CONFIGURATIONSVCC12345678910111213141516171819203940343536373830313233262728292122232425P0.0, AD0P0.1, AD1P0.2, AD2P0.3, AD3P0.4, AD4P0

W78C54Publication Release Date: December 1997- 3 - Revision A2PIN DESCRIPTIONSYMBOL TYPE DESCRIPTIONSEA I EXTERNAL ACCESS ENABLE: This pin forces the

W78C54- 4 -BLOCK DIAGRAMP3.0 ~P3.7P1.0 ~P1.7ALUPort 0LatchPort 1LatchTimer1Timer0Timer2Port1UARTXTAL1 PSENALE GNDVCCRSTXTAL2OscillatorInterruptPSW16

W78C54Publication Release Date: December 1997- 5 - Revision A2FUNCTIONAL DESCRIPTIONThe W78C54 is pin-to-pin compatible with the W78C52, except that t

W78C54- 6 -1. INT2 / INT3Two additional external interrupts, INT2 and INT3, whose functions are similar to those of externalinterrupt 0 and 1 in the s

W78C54Publication Release Date: December 1997- 7 - Revision A2DESCRIPTIONS OF THE SPECIAL FUNCTION REGISTERS (SFRS)SYM. DEFINITIONADDR. MSB

W78C54- 8 -Note: In column BIT_ADDRESS, SYMBOL, containing ( ) item means the bit address. * SFRs modified or added to the W78C52. + Reset value de

W78C54Publication Release Date: December 1997- 9 - Revision A2* Interrupts***IE - Interrupt Enable (A8H)EA - ET2 ES ET1 EX1 ET0 EX0EA: Lobal interrup