TS68230 datasheet(7/61 Pages) STMICROELECTRONICS

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Table 1.2 : Signal Summary.

Signal Name

Input/Output

ActiveState

Edge/Level

Sensitive

OutputStates

CLK

Input

Falling and Rising

Edge

Input

Low

Level

D0-D7

Input/output

High = 1, Low = 0

Level

High, Low, High Impedance

DMAREQ

Output

Low

High, Low

DTACK

Output

Low

High, Low, High Impedance*

H1(H3)***

Input

Low or High

Asserted Edge

H2(H4)**

Input or Output

Low or High

Asserted Edge

High, Low, High Impedance

PA0-PA7**, PB0-PB7**,

PC0-PC7

Input/output,

Input or Output

High = 1, Low = 0

Level

High, Low, High Impedance

PIACK

Input

Low

Level

PIRQ

Output

Low

Low, High Impedance*

RS1-RS5

Input

High = 1, Low = 0

Level

R/W

Input

High Read, Low Write

Level

RESET

Input

Low

Level

TIACK

Input

Low

Level

TIN (external clock)

Input

Rising Edge

TIN (run/halt)

Input

High

Level

TOUT (square wave)

Output

Low

High, Low

TOUT (TIRQ)

Output

Low

Low, High Impedance*

* Pullup resistors required.

** Note these pins have internal pullup resistors.

Figure 1.3 : Logical Pin Connection.

TS68230

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