MC146805E2CFN INNOVASIC [InnovASIC, Inc], MC146805E2CFN Datasheet - Page 7

• Manufacturer Part Number: MC146805E2CFN
• Description: Microprocessor Unit
• Manufacturer: INNOVASIC [InnovASIC, Inc]

IA6805E2
Microprocessor Unit
Registers:
Copyright
innovASIC
The following paragraphs describe the registers contained in the MPU. Figure 6 shows the
programming model and Figure 7 shows the interrupt stacking order.
2002
The End of Obsolescence
INCREASING MEMORY
ADDRESSES
12
12
NOTE: Since the stack pointer decrements during pushes, the PCL is stacked first,
0
0
PCH
followed by PCH, etc. Pulling from the stack is in the reverse order.
0
0
Figure 7. Interrupt Stacking Order
UNSTACK
0
8
7
7
7
0
Figure 6. Programming Model
R
E
T
U
R
N
1
1
0
6
1
0
ENG21108140100
INDEX REGISTER
ACCUMULATOR
4
1
0
H
Page 7 of 31
PCL
A
X
CONDITION CODE
PCL
I
SP
REGISTER
CC
N
PCH
Z
0
C
0
0
0
0
ACCUMULATOR
INDEX REGISTER
PROGRAM COUNTER
STACK POINTER
CONDITION CODE REGISTER
CARRY/BORROW
ZERO
NEGATIVE
INTERRUPT MASK
HALF CARRY
STACK
I
N
T
E
R
R
U
P
T
As of Production Version 00
DECREASING MEMORY
ADDRESSES
Data Sheet
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