Instruction Register; Figure 7-7. Bidirectional Cell (Iox0.Cell); Figure 7-8. General Arrangement For Bidirectional Pins - Motorola MC68306 User Manual

1 – EXTEST
0 – OTHERWISE
OUTPUT
FROM
SYSTEM
LOGIC
1
FROM PIN
OUTPUT
ENABLE
OUTPUT
DATA
INPUT
DATA
NOTE: More than one lO.Cell could be serially connected and controlled by a single En.Cell.

Figure 7-8. General Arrangement for Bidirectional Pins

7.4 INSTRUCTION REGISTER

The MC68306 IEEE 1149.1 implementation includes the three mandatory public
instructions (EXTEST, SAMPLE/PRELOAD, and BYPASS), the optional public ID
instruction, plus one additional public instruction (CLAMP) defined by IEEE 1149.1. The
MOTOROLA
SHIFT DR
G1
1
MUX
PREVIOUS

Figure 7-7. Bidirectional Cell (IOx0.Cell)

TO NEXT CELL
EN.CELL
*
IO.CELL
FROM LAST CELL
MC68306 USER'S MANUAL
G1
1
MUX
1
FROM CLOCK DR
CELL
EN
TO NEXT
CELL
1D
1D
C1
C1
UPDATE DR
I/O
PIN
TO OUTPUT
DRIVER
INPUT TO
SYSTEM
LOGIC
7-9