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| Datasheet File OCR Text: |
| LH0082 (1/2) IL08 COUNTER TIMER CIRCUIT --TOP VIEW-- INPUTS CE CS0, CS1 CT0 - CT3 IEI IORQ M1 READ O D4 I/O 1 D5 I/O 2 D6 I/O 3 D7 I/O 4 GND 5 READ IN 6 Z0 OUT 7 Z1 OUT 8 Z2 OUT 9 IORQ IN 10 IEO OUT 11 INT OUT 12 IEI IN 13 M1 IN 14 28 D3 I/O 27 D2 I/O 26 D1 I/O 25 D0 I/O 24 VDD 23 E IN 22 CT0 IN 21 CT1 IN 20 CT2 IN 19 CT3 IN 18 CSO IN 17 RESET IN 16 CE IN 15 O IN : : : : : : : : CHIP ENABLE CHANNEL SELECT EXTERNAL CLOCK/TIMER TRIGGER INTERRUPT ENABLE I/O REQUEST MACHINE CYCLE1 READ CYCLE STATUS SYSTEM CLOCK OUTPUTS IEO : INTERRUPT ENABLE INT : INTERRUPT REQUEST (OPEN DRAIN) Z0 - Z2 : ZERO COUNT/TIME OTHERS D0 - D7 : 3-STATE DATA CHANNEL SELECT FUNCTION CS1 CS0 0 0 1 1 0 1 0 1 SELECTED CHANNEL 0 1 2 0 : LOW LEVEL 3 1 : HIGH LEVEL w w w .d ee sh ta a u. t4 om c www..com LH0082 (2/2) D0 D1 D2 D3 D4 D5 D6 D7 25 26 27 28 1 2 3 4 CHANNEL 0 PRESCALER 15 23 O CT0 Z0 DOWN COUNTER TIME CONSTANT REGISTER CHANNEL CONTROL REGISTER 7 18 19 8-BIT INTERNAL BUS CE M1 IORQ READ RESET CS0 CS1 16 14 10 6 17 INTERRUPT CONTROL LOGIC 22 8 CT1 Z1 CHANNEL 1 IEI IEO 13 11 12 INT INTERRUPT CONTROL LOGIC 21 9 CT2 Z2 CHANNEL 2 INTERNAL CONTROL LOGIC 20 CT3 CHANNEL 3 |
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