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8XC196NT Arkusz danych(PDF) 6 Page - Intel Corporation |
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8XC196NT Arkusz danych(HTML) 6 Page - Intel Corporation |
6 / 31 page 8XC196NT PIN DESCRIPTIONS (Continued) Symbol Name and Function P52WR WRL SLPWR Write and Write Low output to external memory as selected by the CCR WR will go low for every external write while WRL will go low only for external writes where an even byte is being written WR WRL is active during external memory writes Also an LSIO pin when not used as WR WRL SLPWR is the Slave Port Write Control Input P55BHE WRH Byte High Enable or Write High output as selected by the CCR BHEe0 selects the bank of memory that is connected to the high byte of the data bus A0e0 selects that bank of memory that is connected to the low byte Thus accesses to a 16-bit wide memory can be to the low byte only (A0e0 BHEe1) to the high byte only (A0e1 BHEe0) or both bytes (A0e0 BHEe0) If the WRH function is selected the pin will go low if the bus cycle is writing to an odd memory location BHE WRH is only valid during 16-bit external memory readwrite cycles Also an LSIO pin when not BHEWRH P56READY Ready input to lengthen external memory cycles for interfacing with slow or dynamic memory or for bus sharing If the pin is high CPU operation continues in a normal manner If the pin is low prior to the falling edge of CLKOUT the memory controller goes into a wait state mode until the next positive transition in CLKOUT occurs with READY high When external memory is not used READY has no effect The max number of wait states inserted into the bus cycle is controlled by the CCRCCR1 Also an LSIO pin when READY is not selected P54SLPINT Dual function IO pin As a bidirectional port pin or as a system function The system function is a Slave Port Interrupt Output Pin P62T1CLK Dual function IO pin Primary function is that of a bidirectional IO pin however it may also be used as a TIMER1 Clock input The TIMER1 will increment or decrement on both positive and negative edges of this pin 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 pin is high and decrements when this pin is low PORT1EPA0 – 7 Dual function IO port pins Primary function is that of bidirectional IO System function is that of High Speed capture and compare EPA0 and EPA2 have yet P60 – 61EPA8 – 9 another function of T2CLK and T2DIR of the TIMER2 timercounter PORT 0ACH4 – 7 4-bit high impedance input-only port These pins can be used as digital inputs andor as analog inputs to the on-chip AD converter These pins are also used as inputs to OTPROM parts to select the Programming Mode P63 – 67SSIO Dual function IO ports that have a system function as Synchronous Serial IO Two pins are clocks and two pins are data providing full duplex capability PORT 2 8-bit multi-functional port All of its pins are shared with other functions PORT 3 and 4 8-bit bidirectional IO ports with open drain outputs These pins are shared with the multiplexed addressdata bus which has strong internal pullups EPORT 8-bit bidirectional standard and IO port These bits are shared with the extended address bus A16 – A19 Pin function is selected on a per pin basis INTOUT Interrupt Output This active-low output indicates that a pending interrupt requires use of the external bus SLP0 – SLP7 Slave Port AddressData Bus 6 |
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