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87C196CB Datasheet(PDF) 7 Page - Intel Corporation |
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87C196CB Datasheet(HTML) 7 Page - Intel Corporation |
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7 / 33 page  87C196CA87C196CB Symbol Name and Function VCC Main Supply Voltage (a5V) VSS VSS1 Digital circuit ground (0V) There are 7 VSS pins CB (4 on CA) all of which MUST be connected to a single ground plane VREF Reference for the AD converter (a5V) VREF is also the supply voltage to the analog portion of the AD converter and the logic used to read Port 0 Must be connected for AD and Port 0 to function ANGND Reference ground for the AD converter Must be held at nominally the same potential as VSS VPP Programming voltage for EPROM parts It should be a125V for programming It is also the timing pin for the return from powerdown circuit Connect this pin with a 1 mF capacitor to VSS and a 1Mohm resistor to VCC If this function is not used VPP may be tied to VCC XTAL1 Input of the oscillator inverter and the internal clock generator XTAL2 Output of the Oscillator Inverter RESET Reset input to the chip Input low for at least 16 state times will reset the chip The subsequent low to high transition resynchronizes CLKOUT and commences a 10-state time sequence in which the PSW is cleared bytes are read from 2018H 201Ah and 201CH (if enabled) loading the CCB’s and a jump to location 2080H is executed Input high for normal operation RESET has an internal pullup NMI A positive transition causes a non-maskable interrupt vector through memory location 203EH If not used this pin should be tied to VSS May be used by Intel Evaluation boards EA Input for memory select (External Access) EA equal to a high causes memory accesses to locations 0FF2000H through 0FFFFFFH to be directed to on-chip EPROMROM EA equal to a low causes accesses to these locations to be directed to off-chip memory EA ea 125V causes execution to begin in the Programming Mode EA is latched at reset PLLEN Selects between PLL mode or PLL bypass mode This pin must be either tied high or low PLLEN pin e 0 bypass PLL mode PLLEN pin e 1 places a 4x PLL at the input (196CB only) of the crystal oscillator Allows for a low frequency crystal to drive the device (ie 5 MHz e 20 MHz operation) P64 – 67SSIO Dual function IO ports have a system function as Synchronous Serial IO Two pins are clocks and two pins are data providing for full duplex capability Also LSIO when not used as SSIO P63T1DIR Dual function IO pin Primary function is that of a bidirectional IO pin however it may also be used as a TIMER1 Direction input The TIMER1 will increment when this (CB only) pin is high and decrements when this pin is low P62T1CLK Dual function IO pin Primary function is that of a bidirectional IO pin however may also be used as a TIMER1 Clock input The TIMER1 will increment or decrement on (CB only) both positive and negative edges of this pin P60 – 61EPA8 – 9 Dual function IO port pins Primary function is that of bidirectional IO System function is that of High Speed capture and compare 7 |
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