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87C196KD Datasheet(PDF) 6 Page - Intel Corporation

Part No. 87C196KD
Description  16-BIT HIGH PERFORMANCE CHMOS MICROCONTROLLER
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Maker  INTEL [Intel Corporation]
Homepage  http://www.intel.com
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AUTOMOTIVE 87C196KD
PIN DESCRIPTIONS (Continued)
Symbol
Name and Function
READY
Ready input to lengthen external memory cycles for interfacing to slow or dynamic memory
or for bus sharing When the external memory is not being used READY has no effect
HSI
Inputs to High Speed Input Unit Four HSI pins are available HSI0 HSI1 HSI2 and HSI3
Two of them (HSI2 and HSI3) are shared with the HSO Unit
HSO
Outputs from High Speed Output Unit Six HSO pins are available HSO0 HSO1 HSO2
HSI3 HSO4 and HSO5 Two of them (HSO4 and HSO5) are shared with the HSI Unit
Port 0
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
Port 1
8-bit quasi-bidirectional IO port
Port 2
8-bit multi-functional port All of its pins are shared with other functions in the 87C196KD
Ports 3 and 4
8-bit bidirectional IO ports with open drain outputs These pins are shared with the
multiplexed addressdata bus
HOLD
Bus Hold input requesting control of the bus
HLDA
Bus Hold acknowledge output indicating release of the bus
BREQ
Bus Request output activated when the bus controller has a pending external memory
cycle
6




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