HYUNDAI MicroElectronics | GMS90X5XC Series |
CPU
The GMS90X5XC series is efficient both as a controller and as an arithmetic processor. It has extensive facili- ties for binary and BCD arithmetic and excels in its
Special Function Register PSW
Bit No.
Addr. D0H
MSB |
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| LSB |
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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CY | AC | F0 | RS1 | RS0 | OV | F1 | P |
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PSW
Bit |
| Function |
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CY |
| Carry Flag |
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AC |
| Auxiliary Carry Flag (for BCD operations) |
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F0 |
| General Purpose Flag |
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RS1 | RS0 | Register Bank select control bits |
0 | 0 | Bank 0 selected, data address 00H - 07H |
0 | 1 | Bank 1 selected, data address 08H - 0FH |
1 | 0 | Bank 2 selected, data address 10H - 17H |
1 | 1 | Bank 3 selected, data address 18H - 1FH |
OV |
| Overflow Flag |
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F1 |
| General Purpose Flag |
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P |
| Parity Flag |
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| Set/cleared by hardware each instruction cycle to indicate an odd/even |
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| number of "one" bits in the accumulator, i.e. even parity. |
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Reset value of PSW is 00H.
10 | Jan. 2001 Ver 1.0 |
