MC6800 Motorola, MC6800 Datasheet - Page 10

• Manufacturer Part Number: MC6800
• Description: 8-BIT MICROPROCESSING UNIT (MPU)
• Manufacturer: Motorola

1
programs
be brought high for one MPU cycle and then returned low as
shown
will go low at tBA after the leading edge of the next @l, in-
dicating
HALT
To debug
must occur tpcs
at point
that the Address
Y
instruction
programs
1 +BA
B of Figure
f
byinstruction
m
it is advantageous
before the trailing edge of $1. BA
Bus, Data
Y
I
13. Again,
MOTOROLA
.To
Bus, VMA
1
do this, HALT must
the transitions
to step through
3
FIGURE
and Rl~
10 –
of
MPU
3
Semiconductor
2
1.
10
Reset is recognized at any position in the flowchart.
Instructions which affect the l-Bit act upon a on~bh buffer register,
“lTMP.” This has the effect of delaying any CLEARING of the l-Bit one
clock time. Setting the l-Bit, however, is not delayed.
See Tables 6-11 for details of Instruction
FLOWCHART
Iinesare
such as LSRisused
cle, the instruction
returns high at tBA on the last cycle of the instruction
dicating
three cycles, the width of the BA low time would have been
increased
the MPU
0
back on the bus. Asingle
by one cycle.
A
Products Inc.
is off the bus. If instruction
forth isexample
Y is fetched
Execution.
from address
byte, 2 cycle instruction
also. During the first cy-
Y had been
M+l.
BA
in-