Z8L180 ZILOG [Zilog, Inc.], Z8L180 Datasheet - Page 193
Z8L180
Manufacturer Part Number
Z8L180
Description
Z8018x Family MPU
Manufacturer
ZILOG [Zilog, Inc.]
Datasheet
1.Z8L180.pdf
(326 pages)
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178
Flag Register
UM005001-ZMP0400
Bit
Bit/Field
R/W
Reset
R = Read W = Write X = Indeterminate ? = Not Applicable
Bit
Position Bit/Field R/W
7
Z 8018x Fam il y
M PU Us e r M anual
S
R/W
7
S
0
Stack Pointer (SP)
The Stack Pointer (SP) contains the memory address based LIFO stack.
SP is cleared to
Program Counter (PC)
The Program Counter (PC) contains the address of the instruction to be
executed and is automatically updated after each instruction fetch. PC is
cleared to
Flag Register (F)
The Flag Register stores the logical state reflecting the results of instruction
execution. The contents of the Flag Register are used to control program
flow and instruction operation.
R/W
R/W
Z
6
0
0000H
Value
0
Not Used
0000H
during reset.
5
?
?
Description
Sign
(bit 7) of the result. This is useful for operations with
signed numbers in which values with bit 7 = 1 are
interpreted as negative.
during reset.
.
S stores the state of the most significant bit
R/W
H
4
0
Not Used
3
?
?
R/W
P/V
2
0
R/W
N
1
0
R/W
C
0
0
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