Samsung KS57C2308 Manual page 66

MEMORY MAP
PSW
— Program Status Word
Bit
Identifier
Value
RESET
Read/Write
Bit Addressing
C
SC2–SC0
IS1, IS0
EMB
ERB
NOTES:
1. The value of the carry flag after a RESET occurs during normal operation is undefined. If a RESET occurs during
power-down mode (IDLE or STOP), the current value of the carry flag is retained.
2. The carry flag can only be addressed by a specific set of 1-bit manipulation instructions. See Section 2 for
detailed information.
4-24
7 6
C SC2
0
(1)
R/W R
8
(2)
Carry Flag
0 No overflow or borrow condition exists
1 An overflow or borrow condition does exist
Skip Condition Flags
0 No skip condition exists; no direct manipulation of these bits is allowed
1 A skip condition exists; no direct manipulation of these bits is allowed
Interrupt Status Flags
0 0 Service all interrupt requests
0 1 Service only the high-priority interrupt(s) as determined in the interrupt
priority register (IPR)
1 0 Do not service any more interrupt requests
1 1 Undefined
Enable Data Memory Bank Flag
0 Restrict program access to data memory to bank 15 (F80H–FFFH) and to
the locations 000H–07FH in the bank 0 only
1 Enable full access to data memory banks 0, 1, 2, and 15
Enable Register Bank Flag
0 Select register bank 0 as working register area
1 Select register banks 0, 1, 2, or 3 as working register area in accordance with
the select register bank (SRB) instruction operand
5 4
SC1 SC0 IS1
0 0
R R R/W
8 8 1/4/8
KS57C2308/P2308/C2316/P2316
3 2 1
IS0 EMB
0 0 0
R/W R/W
1/4/8 1/4/8
FB1H, FB0H
0
ERB
0
R/W
1/4/8