AN87C196KT データシートの表示（PDF） - Intel

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AN87C196KT

20MHz ADVANCED 16-BIT CHMOS MICROCONTROLLER

Intel 

87C196KT 87C196KS

PIN DESCRIPTIONS (Continued)

Symbol

Name and Function

P5 5 BHE 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

BHE WRH

P5 6 READY

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

P5 4 SLPINT

Dual function I O pin As a bidirectional port pin or as a system function The system

function is a Slave Port Interrupt Output Pin

P6 2 T1CLK

Dual function I O pin Primary function is that of a bidirectional I O 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

P6 3 T1DIR

Dual function I O pin Primary function is that of a bidirectional I O 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

PORT1 EPA0–7

P6 0–6 1 EPA8–9

Dual function I O port pins Primary function is that of bidirectional I O System

function is that of High Speed capture and compare EPA0 and EPA2 have yet

another function of T2CLK and T2DIR of the TIMER2 timer counter

PORT 0 ACH0–7

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 These pins are also used as inputs to

EPROM parts to select the Programming Mode

P6 3–6 7 SSIO

Dual function I O ports that have a system function as Synchronous Serial I O 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 I O ports with open drain outputs These pins are shared with the

multiplexed address data bus which has strong internal pullups

5

5

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