Specifications

CY7C67200
Document Number: 38-08014 Rev. *J Page 12 of 93
CPU Flags Register [0xC000] [R]
Figure 7. CPU Flags Register
Register Description
The CPU Flags register is a read only register that gives
processor flags status.
Global Interrupt Enable (Bit 4)
The Global Interrupt Enable bit indicates if the Global Interrupts
are enabled.
1: Enabled
0: Disabled
Negative Flag (Bit 3)
The Negative Flag bit indicates if an arithmetic operation results
in a negative answer.
1: MS result bit is ‘1’
0: MS result bit is not ‘1’
Overflow Flag (Bit 2)
The Overflow Flag bit indicates if an overflow condition has
occurred. An overflow condition can occur if an arithmetic result
was either larger than the destination operand size (for addition)
or smaller than the destination operand should allow for
subtraction.
1: Overflow occurred
0: Overflow did not occur
Carry Flag (Bit 1)
The Carry Flag bit indicates if an arithmetic operation resulted in
a carry for addition, or borrow for subtraction.
1: Carry/Borrow occurred
0: Carry/Borrow did not occur
Zero Flag (Bit 0)
The Zero Flag bit indicates if an instruction execution resulted in
a ‘0’.
1: Zero occurred
0: Zero did not occur
Bit # 15 14 13 12 11 10 9 8
Field Reserved...
Read/Write – – – – – – – –
Default 0 0 0 0 0 0 0 0
Bit # 7 6 5 4 3 2 1 0
Field
...Reserved Global
Interrupt
Enable
Negative
Flag
Overflow
Flag
Carry
Flag
Zero
Flag
Read/Write – – – R R R R R
Default 0 0 0 X X X X X