6-2. KEY/DISPLAY SCAN
Key/display scan and key read are performed at the following timing.
1Key/display scan cycle: 10ms
2 Blanking time: 50us
3 KEY DATA READ timing: Read before 10~100us of strobe signal OFF.
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LED Segment Signal |
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Address | Bit7 |
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100000h | DP |
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<CPU PORT> |
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131 |
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| KS0 | KEY STROBE SIGNAL 0 |
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129 |
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| KS1 | KEY STROBE SIGNAL 1 |
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128 |
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| KS2 | KEY STROBE SIGNAL 2 |
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127 |
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| KS3 | KEY STROBE SIGNAL 3 |
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126 |
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| LS0 | LED STROBE SIGNAL 0 |
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125 |
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| LS1 | LED STROBE SIGNAL 1 |
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124 |
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| LS2 | LED STROBE SIGNAL 2 |
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123 |
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| LS3 | LED STROBE SIGNAL 3 |
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KS3~0 : KEY strobe signal is generated.
LS3~0 : POP UP Display strobe signal is generated.
No. | CPU PORT | Signal to | Function | |
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46 | P70 | KR0# | KEY RETURN SIGNAL 0 | |
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45 | P71 | KR1# | KEY RETURN SIGNAL 1 | |
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44 | P72 | KR2# | KEY RETURN SIGNAL 2 | |
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43 | P73 | KR3# | KEY RETURN SIGNAL 3 | |
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42 | P74 | KR4# | KEY RETURN SIGNAL 4 | |
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41 | P75 | KR5# | KEY RETURN SIGNAL 5 | |
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40 | P76 | KR6# | KEY RETURN SIGNAL 6 | |
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39 | P77 | KR7# | KEY RETURN SIGNAL 7 | |
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14 | P140 | KR8# | KEY RETURN SIGNAL 8 | |
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13 | P141 | KR9# | KEY RETURN SIGNAL 9 | |
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R0#~KR9# : Flat Keyboard KEY Return signal
KR0#~KR7# : Normal Keyboard KEY Return signal
No. | CPU PORT | Signal to | Function | |
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12 | P142 | MODE# | MODE KEY SIGNAL | |
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11 | P143 | FSR# | FEED SENS SIGNAL | |
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The mode key switch and other signals are read at CPU ports P142 and P143 at the key strobe timing.
Reading is made 10~100us before the strobe signal OFF..
P142 | ST0 : | MODE Key SRV | “0” SRV mode |
| ST1 : | MODE Key PGM | “0” PGM mode |
| ST2 : | MODE Key VOID | “0” VOID mode |
| ST3 : | MODE Key OP X/Z | “0” OP X/Z mode |
| ST4 : | MODE Key REG | “0” REG mode |
| ST5 : | MODE Key MGR | “0” MGR mode |
| ST6 : | MODE Key X1/Z1 | “0” X1/Z1 mode |
| ST7 : | MODE Key X2/Z2 | “0” X2/Z2 mode |
P143 | ST10 : Receipt feed | “0” Receipt feed | |
| ST11: Journal feed | “0” Journal feed | |
| ST13 : Keypad select | “1” Flat key | |
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| “1” JNormal key |
The Flat Keyboard takes key data in twice during the strobe period. For read timing, refer to the timing chart below.
588us ±20us
KS0 - 3 |
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(0h~Fh repeat) | 0h |
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Key Return Sinnal |
| 10 - 100us |
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| 950 | 25us |
| 50 | 10us |
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LS0 - 3 | 0h | Fh |
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Max.10us |
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LED Segment | 1ST DIGIT |
| 2nd DIGIT |
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Signal | DISPLAY DATA |
| DISPLAY DATA |
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| DISPLAY DATA | ||
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| BLANK |
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| HARDWARE DESCRIPTION |
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– 12 –
