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87C196KT Datasheet(PDF) 5 Page - Intel Corporation

Part No. 87C196KT
Description  ADVANCED 16-BIT CHMOS MICROCONTROLLER
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Maker  INTEL [Intel Corporation]
Homepage  http://www.intel.com
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87C196KT87C196KS
PIN DESCRIPTIONS (Continued)
Symbol
Name and Function
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 write 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 CCR
CCR1 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 0ACH0 – 7
8-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
EPROM 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
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