KEY TOUCH LSI(HG52E35P)
By counting the time between the first key input signal FI and the second SI from the keyboard unit, the key touch LSI detects key velocity of
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| Key Touch LSI |
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| CPU |
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| HG52E35P |
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| HD6433298A16P |
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| RESB |
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| P52/SCK |
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| CCSB |
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| A12 |
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| A14 | |
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| KC0~KC7 |
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| CWRB |
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| P42/IRQ0 | |
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| Keyboard |
| CRDB |
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| FI0~FI9 | CKI |
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| P46/PHI |
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| SI0~SI9 | P30/D0~P37/D7 |
| D0~D7 |
| CD0~CD7 | |
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| P12/A2~P10/A0 |
| A0~A2 |
| CA0~CA2 | |
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Pin No. | Terminal | In/Out |
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| Function |
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1 | REQB | Out | Interrupt request. Not used. |
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2,3 | FI10,SI10 | In | Connected to +5V. |
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4 | VCC | In | +5V source. |
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5 | CRDB | In | Read enable signal. |
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6 | CWRB | In | Write enable signal. |
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7 | CCBB | In | Chip select signal. |
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8 | T | In | Test terminal. Connected to +5V. |
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9 | STYB | In | Standby terminal. Connected to +5V. |
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10 | RESB | In | Reset signal. |
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11 | W | In | Test terminal. Connected to +5V. |
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12 | CKI | In | External clock input. |
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13 | TMD | In | Test terminal. Connected to ground. |
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14 | TST | In | Test terminal. Connected to ground. |
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15 | CKO | Out | External clock output. Not used. |
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16 | GND | In | Ground(0V) source. |
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17 | XIN | In | Clock pulse input. Connected to ground. |
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18 | XOUT | Out | Clock pulse output. Not used. |
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19 | TRES | In | Test terminal. Connected to ground. |
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20~28 | CD0~CD7 | In/Out | Data bus. |
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24 | GND | In | Ground(0V) source. |
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29~31 | CA0~CA2 | Out | Address bus. |
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32 | VCC | In | +5V source. |
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33~43 | FI0~FI9 |
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53~55 | In | Key input signal. |
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SI0~SI9 |
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57~63 |
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40 | VCC | In | +5V source. |
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44~53 | KC0~KC7 | Out | Key scan signal. |
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48,56 | GND | In | Ground(0V) source. |
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54 | VCC | In | +5V source. |
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