TTP-248M Bar Code Printer
Service Manual
3.4 Memory System
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| G ND J 1 |
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| 1 | 2 | A 1 |
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| A 2 | 3 | 4 | A 3 |
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| C S0 |
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| A 4 | 5 | 6 | A 5 |
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| A 6 | 7 | 8 | A 7 |
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| C S2 |
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| A 8 | 9 | 10 | A 9 |
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| C S3 |
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| A 10 | 11 | 12 | A 11 |
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| A 12 | 13 | 14 | A 13 |
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| A 14 | 15 | 16 | A 15 |
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| A 16 | 17 | 18 | A 17 |
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| A 18 | 19 | 20 | A 19 |
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| A 20 | 21 | 22 | A 21 |
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| A 22 | 23 | 24 | A 23 |
| V CC |
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| V CC |
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| V CC | 25 | 26 |
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| A 24 | 27 | 28 |
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| B C3 5 | B C3 4 |
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| 29 | 30 |
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| B C4 5 | B C3 9 | B C3 8 | B C3 67 |
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| /R ESET31 | 32 | /W E |
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| 0. 1uF | 0. 1uF | 0. 1uF | 0. 1uF | 0. 1uF | 0. 1uF |
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| /O E | 33 | 34 | D 0 |
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| D 1 | 35 | 36 | D 2 |
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| G ND |
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| D 3 | 37 | 38 | D 4 |
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| D 5 | 39 | 40 | D 6 |
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| D 7 | 41 | 42 | D 8 |
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| V CC |
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| D 9 | 43 | 44 | D 10 |
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| D 11 | 45 | 46 | D 12 |
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| B C4 2 | B C4 1 | B C4 0 |
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| D 13 | 47 | 48 | D 14 |
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| B C4 6 | B C4 4 | B C4 3 |
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| D 15 | 49 | 50 |
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| 0. 1uF | 0. 1uF | 0. 1uF | 0. 1uF | 0. 1uF | 0. 1uF |
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| 50 PIN _ P2 |
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| G ND |
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| G ND |
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| C 38V CC |
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| C 37V CC |
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| C 36V CC |
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| C 35V CC |
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| V CC |
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| V CC |
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| 37 |
| 9 10 13 14 |
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| 37 |
| 9 10 13 14 |
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| 37 |
| 9 10 13 14 |
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| 37 |
| 9 10 13 14 |
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| 1 25 |
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| 1 25 | 7 13 38 44 |
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| G ND0. 1uF |
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| G ND0. 1uF |
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| G ND0. 1uF |
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| G ND0. 1uF |
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| EM 6 36 165 |
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| EM 6 36 165 |
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| U 23 |
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| U 24 |
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| U 25 |
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| U 26 |
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| U 28 |
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| U 27 |
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| A 1 | 25 | A 0cc | C C C C | D Q0 | 29 | D 0 | A 1 | 25 | A 0cc | C C C C | D Q0 | 29 | D 0 | A 1 | 25 | A 0cc | C C C C | D Q0 | 29 | D 0 | A 1 | 25 | A 0cc | C C C C | D Q0 | 29 | D 0 | ||||
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D 0 | 2 | D Q0 |
| DD Q DD Q DD Q DD Q |
| A 0 | 21 | A 2 | D 16 | 2 | D Q0 | DD Q DD Q DD Q DD Q | A 0 | 21 | A 2 | A 2 | 24 | V | N N N N | D Q1 | 31 | D 1 | A 2 | 24 | V | N N N N | D Q1 | 31 | D 1 | A 2 | 24 | V | N N N N | D Q1 | 31 | D 1 | A 2 | 24 | V | N N N N | D Q1 | 31 | D 1 | ||||||
D 1 | 3 | DD |
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| 22 | A 3 | D 17 | 3 |
| DD |
| 22 | A 3 | A 3 | 23 |
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| 33 | D 2 | A 3 | 23 |
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| 33 | D 2 | A 3 | 23 |
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| 33 | D 2 | A 3 | 23 |
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| 33 | D 2 | |||||||||||
D 2 | 5 | D Q1V VDD |
| A 1 | 23 | A 4 | D 18 | 5 | D Q1V VDD | A 1 | 23 | A 4 | A 4 | 22 | A 2 | D Q2 | 35 | D 3 | A 4 | 22 | A 2 | D Q2 | 35 | D 3 | A 4 | 22 | A 2 | D Q2 | 35 | D 3 | A 4 | 22 | A 2 | D Q2 | 35 | D 3 | |||||||||||||
D 3 | 6 | D Q2 |
| V V V V |
| A 2 | 24 | A 5 | D 19 | 6 | D Q2 | V V V V | A 2 | 24 | A 5 | A 5 | 21 | A 3 |
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| D Q3 | 38 | D 4 | A 5 | 21 | A 3 |
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| D Q3 | 38 | D 4 | A 5 | 21 | A 3 |
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| D Q3 | 38 | D 4 | A 5 | 21 | A 3 |
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| D Q3 | 38 | D 4 | ||
D Q3 |
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| A 3 | D Q3 |
| A 3 | A 4 |
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| D Q4 | A 4 |
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| D Q4 | A 4 |
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| D Q4 | A 4 |
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| D Q4 | |||||||||||||||||||||||||
D 4 | 8 |
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| 27 | A 6 | D 20 | 8 |
| 27 | A 6 | A 6 | 20 |
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| 40 | D 5 | A 6 | 20 |
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| 40 | D 5 | A 6 | 20 |
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| 40 | D 5 | A 6 | 20 |
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| 40 | D 5 | |||||||||||||
D 5 | 9 | D Q4 |
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| A 4 | 28 | A 7 | D 21 | 9 | D Q4 |
| A 4 | 28 | A 7 | A 7 | 19 | A 5 |
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| D Q5 | 42 | D 6 | A 7 | 19 | A 5 |
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| D Q5 | 42 | D 6 | A 7 | 19 | A 5 |
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| D Q5 | 42 | D 6 | A 7 | 19 | A 5 |
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| D Q5 | 42 | D 6 | |
D Q5 |
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| A 5 | D Q5 |
| A 5 | A 6 |
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| D Q6 | A 6 |
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| D Q6 | A 6 |
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| D Q6 | A 6 |
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| D Q6 | |||||||||||||||||||||||||
D 6 | 11 | D Q6 |
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| A 6 | 29 | A 8 | D 22 | 11 | D Q6 |
| A 6 | 29 | A 8 | A 8 | 18 | A 7 |
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| D Q7 | 44 | D 7 | A 8 | 18 | A 7 |
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| D Q7 | 44 | D 7 | A 8 | 18 | A 7 |
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| D Q7 | 44 | D 7 | A 8 | 18 | A 7 |
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| D Q7 | 44 | D 7 | |
D 7 | 12 |
| ETRO N TECH | 30 | A 9 | D 23 | 12 | ETRO N TECH | 30 | A 9 | A 9 | 8 |
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| 30 | D 8 | A 9 | 8 |
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| 30 | D 8 | A 9 | 8 |
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| 30 | D 8 | A 9 | 8 |
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| 30 | D 8 | |||||||||||||||
D 8 | 39 | D Q7 |
| EM 6 36 165 |
| A 7 | 31 | A 10 | D 24 | 39 | D Q7 | EM 6 36 165 | A 7 | 31 | A 10 | A 10 | 7 | A 8 | A M 2 9LV8 00 B | D Q8 | 32 | D 9 | A 10 | 7 | A 8 | A M 2 9LV8 00 B | D Q8 | 32 | D 9 | A 10 | 7 | A 8 | A M 2 9LV8 00 B | D Q8 | 32 | D 9 | A 10 | 7 | A 8 | A M 2 9LV8 00 B | D Q8 | 32 | D 9 | ||||||
D Q8 |
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| A 8 | D Q8 | A 8 | A 9 | D Q9 | A 9 | D Q9 | A 9 | D Q9 | A 9 | D Q9 | ||||||||||||||||||||||||||||||||||||
D 9 | 40 | D Q9 |
| 1M x 16 |
| A 9 | 32 | A 11 | D 25 | 40 | D Q9 | 1M x 16 | A 9 | 32 | A 11 | A 11 | 6 | A 10 |
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| D Q1 0 | 34 | D 10 | A 11 | 6 | A 10 |
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| D Q1 0 | 34 | D 10 | A 11 | 6 | A 10 |
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| D Q1 0 | 34 | D 10 | A 11 | 6 | A 10 |
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| D Q1 0 | 34 | D 10 | ||
D 10 | 42 |
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| 20 | A 12 | D 26 | 42 |
| 20 | A 12 | A 12 | 5 |
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| 36 | D 11 | A 12 | 5 |
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| 36 | D 11 | A 12 | 5 |
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| 36 | D 11 | A 12 | 5 |
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| 36 | D 11 | |||||||||||||
D 11 | 43 | D Q1 0 |
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| A P/A 10 | 19 | A 13 | D 27 | 43 | D Q1 0 | A P/A 10 | 19 | A 13 | A 13 | 4 | A 11 |
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| D Q1 1 | 39 | D 12 | A 13 | 4 | A 11 |
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| D Q1 1 | 39 | D 12 | A 13 | 4 | A 11 |
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| D Q1 1 | 39 | D 12 | A 13 | 4 | A 11 |
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| D Q1 1 | 39 | D 12 | |||
D Q1 1 |
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| B S/A 11 | D Q1 1 | B S/A 11 | A 12 |
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| D Q1 2 | A 12 |
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| D Q1 2 | A 12 |
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| D Q1 2 | A 12 |
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| D Q1 2 | |||||||||||||||||||||||||||
D 12 | 45 | D Q1 2 |
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| D 28 | 45 | D Q1 2 |
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| A 14 | 3 | A 13 |
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| D Q1 3 | 41 | D 13 | A 14 | 3 | A 13 |
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| D Q1 3 | 41 | D 13 | A 14 | 3 | A 13 |
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| D Q1 3 | 41 | D 13 | A 14 | 3 | A 13 |
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| D Q1 3 | 41 | D 13 | |
D 13 | 46 |
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| 36 |
| D 29 | 46 |
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| 36 |
| A 15 | 2 |
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| 43 | D 14 | A 15 | 2 |
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| 43 | D 14 | A 15 | 2 |
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| 43 | D 14 | A 15 | 2 |
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| 43 | D 14 | |||||||||||
D Q1 3 |
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| U DQ M |
| D Q1 3 | U DQ M |
| A 14 |
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| D Q1 4 | A 14 |
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| D Q1 4 | A 14 |
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| D Q1 4 | A 14 |
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| D Q1 4 | |||||||||||||||||||||||||
D 14 | 48 | D Q1 4 |
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| LD Q M | 14 |
| D 30 | 48 | D Q1 4 | LD Q M | 14 |
| A 16 | 1 | A 15 |
| D Q1 5/A | 45 | D 15 | A 16 | 1 | A 15 |
| D Q1 5/A | 45 | D 15 | A 16 | 1 | A 15 |
| D Q1 5/A | 45 | D 15 | A 16 | 1 | A 15 |
| D Q1 5/A | 45 | D 15 | |||||||
D 15 | 49 |
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| 15 |
| D 31 | 49 | 15 |
| A 17 | 48 |
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| A 17 | 48 |
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| A 17 | 48 |
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| A 17 | 48 |
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| D Q1 5 |
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| /W E | 16 |
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| D Q1 5 |
| /W E | 16 |
| A 18 | 17 | A 16 |
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| 15 | V CC | A 18 | 17 | A 16 |
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R OM 1 |
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D QM LU |
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A [0.. 25 ] |
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D [0.. 31 ] |
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Fig. 3.4 Memory System
This is memory circuit. The 23U,24U, 25U, 26U which type 1M Bytes Flash memory and U27, U28 which type 2M Bytes SDRAM are used. The MCU WR/RD pin becomes to “H” while Reading flash memory or SDRAM; similarly, become to “L” while Writing.
22
