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68 <strong>AT89C51ID2</strong><br />
Table 50. IPH0 Register<br />
IPH0 - Interrupt Priority High Register (B7h)<br />
7 6 5 4 3 2 1 0<br />
Bit<br />
Number<br />
- PPCH PT2H PSH PT1H PX1H PT0H PX0H<br />
7 -<br />
Bit<br />
Mnemonic Description<br />
6 PPCH<br />
5 PT2H<br />
4 PSH<br />
3 PT1H<br />
2 PX1H<br />
1 PT0H<br />
0 PX0H<br />
Reset Value = X000 0000b<br />
Not bit addressable<br />
Reserved<br />
The value read from this bit is indeterminate. Do not set this bit.<br />
PCA interrupt Priority high bit.<br />
PPCHPPCLPriority Level<br />
0 0Lowest<br />
0 1<br />
1 0<br />
1 1Highest<br />
Timer 2 overflow interrupt Priority High bit<br />
PT2HPT2LPriority Level<br />
0 0Lowest<br />
0 1<br />
1 0<br />
1 1Highest<br />
Serial port Priority High bit<br />
PSH PSLPriority Level<br />
0 0Lowest<br />
0 1<br />
1 0<br />
1 1Highest<br />
Timer 1 overflow interrupt Priority High bit<br />
PT1HPT1L Priority Level<br />
0 0 Lowest<br />
0 1<br />
1 0<br />
1 1 Highest<br />
External interrupt 1 Priority High bit<br />
PX1HPX1LPriority Level<br />
0 0Lowest<br />
0 1<br />
1 0<br />
1 1Highest<br />
Timer 0 overflow interrupt Priority High bit<br />
PT0HPT0LPriority Level<br />
0 0Lowest<br />
0 1<br />
1 0<br />
1 1Highest<br />
External interrupt 0 Priority High bit<br />
PX0H PX0LPriority Level<br />
0 0Lowest<br />
0 1<br />
1 0<br />
1 1Highest<br />
4289A–8051–09/03