IA2910A
Data Sheet
Microprogram Controller
August 19, 2008
instruction 15 the test condition is passed, no branch is taken; the microprogram counter register
furnishes the next address. When the loop is ended, either by the count becoming zero, or by
passing the conditional test, the stack is POP’d by decrementing the stack pointer, since interest in
the value contained at the top of the stack is then complete.
As one example, consider the case of a memory search instruction. As shown in Figure II, the
instruction at microprogram address 63 can be Instruction 4 (PUSH), which will push the value 64
onto the microprogram stack and load the number N, which is one less than the number of memory
locations to be searched before giving up. Location 64 contains a microinstruction which fetches
the next operand from the memory area to be searched and compares it with the search key.
Location 65 contains a microinstruction which tests the result of the comparison and also is a TWB
for microprogram control. If no match is found, the test fails and the microprogram goes back to
location 64 for the next operand address. When the count becomes zero, the microprogram
branches to location 72, which does whatever is necessary if no match is found. If a match occurs
on any execution of the TWB at location 65, control falls through to location 66 which handles this
case. Whether the instruction ends by finding a match or not, the stack will have been POP’d once,
removing the value 64 from the top of the stack.
Commercial AC/DC Parameters
Absolute Maximum Ratings
PARAMETER
Min
-0.3
-0.3
-20
0
Max
7.0
VDD + 0.3
20
UNITS
Notes
Supply voltage, VDD
Input voltage, VIN
Input Pin Current IIN
Operating temperature
range
V
V
mA
C
85
Storage temperature range
-65
0
150
85
C
C
Ambient Temperature, Ta
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the
device. Operation at the “absolute maximum ratings” may adversely affect device reliability.
Commercial DC Characteristics
PARAMETER
Min
4.5
Max
5.5
100
169
156
0.8
UNITS
Notes
DC Supply voltage, VDD
Static Supply Current, IDD
Input Capacitance, CIN
I/O Capacitance, CI/O
Circuit Ground, VSS
V
A
pF
pF
V
(1)
Notes:
(1) Static IDD current is exclusive of input/output drive requirements and is measured with the clocks
stopped and all inputs tied to VDD or VSS, configured to draw minimum current.
IA211030314-03
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