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HYUNDAI MicroElectronics | GMS90X5XC Series |
TIMER / COUNTER 0 AND 1
Timer/Counter 0 and 1 can be used in four operating modes as listed in Table 4:
Table 4. Timer/Counter 0 and 1 Operating Modes
Mode | Description |
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| TMOD |
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| Gate | C/T |
| M1 | M0 | internal | external (Max.) | |
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0 | X | X |
| 0 | 0 | fOSC ÷(12×32) | fOSC ÷(24×32) | ||
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1 | X | X |
| 0 | 1 | fOSC ÷12 | fOSC ÷24 | ||
2 | X | X |
| 1 | 0 | fOSC ÷12 | fOSC ÷24 | ||
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3 | Timer/counter 0 used as | X | X |
| 1 | 1 | fOSC ÷12 | fOSC ÷24 | |
| one |
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| stops |
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In the "timer" function (C/T = "0") the register is incremented every machine cycle. Therefore the count rate is fOSC/12.
In the "counter" function the register is incremented in response to a
fOSC |
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C/T
TMOD
0
P3.4/T0 |
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P3.5/T1 |
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Max. fOSC/24 |
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| TR0 / 1 |
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| TCON |
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| =1 |
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| TMOD |
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| ≥1 |
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P3.2 / | INT0 |
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P3.3 / INT1 |
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fOSC ÷ 12
Timer 0/1 Input Clock
Figure 4. Timer/Counter 0 and 1 Input Clock Logic
18 | Jan. 2001 Ver 1.0 |