Instruction Register; Bidirectional Data Cell (Io.cell); General Arrangement For Bidirectional Pins - Motorola MC68340 User Manual

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1 – EXTEST
0 – OTHERWISE
G1
OUTPUT
FROM
1
SYSTEM
LOGIC
1
FROM OUTPUT
ENABLE
OUTPUT
ENABLE
OUTPUT
DATA
INPUT
DATA
NOTE: More than one lO.Cell could be serially connected and controlled by a single IO.Ctlx cell.
Figure 9-8. General Arrangement for Bidirectional Pins

9.4 INSTRUCTION REGISTER

The MC68340 IEEE 1149.1 implementation includes the three mandatory public
instructions (EXTEST, SAMPLE/PRELOAD, and BYPASS), but does not support any of
the optional public instructions defined by IEEE 1149.1. One additional public instruction
(HI-Z) provides the capability for disabling all device output drivers. The MC68340
MOTOROLA
Freescale Semiconductor, Inc.
SHIFT DR
MUX
G1
1
MUX
1
FROM PIN
FROM LAST
CELL
Figure 9-7. Bidirectional Data Cell (IO.Cell)
TO NEXT CELL
IO.CTL0
OR
IO.CTL1
*
IO.CELL
FROM LAST CELL
BIDIRECTIONAL
MC68340 USER'S MANUAL
For More Information On This Product,
Go to: www.freescale.com
G1
1
1D
MUX
1
C1
CLOCK DR
UPDATE DR
EN
TO NEXT
PIN
TO NEXT
CELL
TO OUTPUT
DRIVER
1D
C1
I/O
PIN
9- 9

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