Jameco Electronics 3000 Manuel D’Utilisation

Table 5-1 lists all the pins on the device, along with their direction, function, and pin num-
ber on the package.

Hardware

CLK

Output

Internal Clock

2

B1

CLK32K

Input

32 kHz Oscillator In

49

L6

/RESET

Input

Master Reset

46

M5

RESOUT

Output

Reset Output

50

M6

XTALA1

Input

Main Oscillator In—if an 
external clock is used, this 
pin should be driven by 
the external clock; see 
Technical Note TN235 for 
more information on 
external oscillator circuits

113

B7

XTALA2

Output

Main Oscillator Out

114

A7

CPU Buses

ADDR[19:0]

Output

Address Bus

various

DATA[7:0]

Bidirectional

Data Bus

10–15, 18–
19

D4, E1–E4, 
F1, F4, G0

Status/Control /WDTOUT

Output

WDT Time-Out

43

J5

STATUS

Output

Instruction Fetch First 
Byte

4

C1

SMODE[1:0]

Input

Bootstrap Mode Select

44, 45

K5, L5

Memory Chip 
Selects

/CS0

Output

Memory Chip Select 0

7

D1

/CS1

Output

Memory Chip Select 1

47

J6

/CS2

Output

Memory Chip Select 2

3

B2

Memory 
Output 
Enables

/OE0

Output

Memory Output Enable 0

5

C2

/OE1

Output

Memory Output Enable 1

95

C12

Memory 
Write Enables

/WE0

Output

Memory Write Enable 0

86

F9

/WE1

Output

Memory Write Enable 1

99

B11

I/O Control

/BUFEN

Output

I/O Buffer Enable

42

M4

/IORD

Output

I/O Read Enable

41

L4

/IOWR

Output

I/O Write Enable

40

K4