87C196KD Intel Corporation, 87C196KD Datasheet - Page 6

• Manufacturer Part Number: 87C196KD
• Description: 16-BIT HIGH PERFORMANCE CHMOS MICROCONTROLLER
• Manufacturer: Intel Corporation

AUTOMOTIVE 87C196KD
PIN DESCRIPTIONS
6
READY
HSI
HSO
Port 0
Port 1
Port 2
Ports 3 and 4
HOLD
HLDA
BREQ
Symbol
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
Inputs to High Speed Input Unit Four HSI pins are available HSI 0 HSI 1 HSI 2 and HSI 3
Two of them (HSI 2 and HSI 3) are shared with the HSO Unit
Outputs from High Speed Output Unit Six HSO pins are available HSO 0 HSO 1 HSO 2
HSI 3 HSO 4 and HSO 5 Two of them (HSO 4 and HSO 5) are shared with the HSI Unit
8-bit high impedance input-only port These pins can be used as digital inputs and or as
analog inputs to the on-chip A D converter
8-bit quasi-bidirectional I O port
8-bit multi-functional port All of its pins are shared with other functions in the 87C196KD
8-bit bidirectional I O ports with open drain outputs These pins are shared with the
multiplexed address data bus
Bus Hold input requesting control of the bus
Bus Hold acknowledge output indicating release of the bus
Bus Request output activated when the bus controller has a pending external memory
cycle
(Continued)
Name and Function