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87C196KR Datasheet(PDF) 6 Page - Intel Corporation

Part No. 87C196KR
Description  ADVANCED 16-BIT CHMOS MICROCONTROLLER
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Maker  INTEL [Intel Corporation]
Homepage  http://www.intel.com
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87C196KRKQ 87C196JVJT 87C196JRJQ
PIN DESCRIPTIONS (Continued)
Symbol
Name and Function
P53RD
Read signal output to external memory RD is active only during external memory
reads or LSIO when not used as RD
P52WR WRL
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
P55BHE WRH
Byte High Enable or Write High output as selected by the CCR BHE e 0 selects
the bank of memory that is connected to the high byte of the data bus A0 e 0
selects that bank of memory that is connectd to the low byte Thus accesses to a
16-bit wide memory can be to the low byte only (A0 e 0 BHE e 1) to the high
byte only (A0 e 1 BHE e 0) or both bytes (A0 e 0 BHE e 0) 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 BHE WRH
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 functional 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 IOpin 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
P64 – 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
6




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