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參數資料
| 型號： | 935266845112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 20 MHz, MICROCONTROLLER, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-20 |
| 文件頁數： | 30/58頁 |
| 文件大小： | 312K |
| 代理商： | 935266845112 |
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Philips Semiconductors
Preliminary specification
87LPC764
Low power, low price, low pin count (20 pin)
microcontroller with 4 kB OTP
2000 Jun 01
33
Table 10. Baud Rates, Timer Values, and CPU Clock Frequencies for SMOD1 = 1
Timer Co nt
Baud Rate
Timer Count
2400
4800
9600
19.2k
38.4k
57.6k
115.2k
–1
0.2304
0.4608
0.9216
* 1.8432
* 3.6864
5.5296
* 11.0592
–2
0.4608
0.9216
* 1.8432
* 3.6864
* 7.3728
* 11.0592
–
–3
0.6912
1.3824
2.7648
5.5296
* 11.0592
16.5888
–
–4
0.9216
* 1.8432
* 3.6864
* 7.3728
* 14.7456
–
–5
1.1520
2.3040
4.6080
9.2160
* 18.4320
–
–6
1.3824
2.7648
5.5296
* 11.0592
–
–7
1.6128
3.2256
6.4512
12.9024
–
–8
* 1.8432
* 3.6864
* 7.3728
* 14.7456
–
–9
2.0736
4.1472
8.2944
16.5888
–
–10
2.3040
4.6080
9.2160
* 18.4320
–
–11
2.5344
5.0688
10.1376
–
–12
2.7648
5.5296
* 11.0592
–
–13
2.9952
5.9904
11.9808
–
–14
3.2256
6.4512
12.9024
–
–15
3.4560
6.9120
13.8240
–
–16
* 3.6864
* 7.3728
* 14.7456
–
–17
3.9168
7.8336
15.6672
–
–18
4.1472
8.2944
16.5888
–
–19
4.3776
8.7552
17.5104
–
–20
4.6080
9.2160
* 18.4320
–
–21
4.8384
9.6768
19.3536
–
NOTES TO TABLES 9 AND 10:
1. Tables 6 and 7 apply to UART modes 1 and 3 (variable rate modes), and show CPU clock rates in MHz for standard baud rates from 2400 to
115.2k baud.
2. Table 6 shows timer settings and CPU clock rates with the SMOD1 bit in the PCON register = 0 (the default after reset), while Table 7
reflects the SMOD1 bit = 1.
3. The tables show all potential CPU clock frequencies up to 20 MHz that may be used for baud rates from 9600 baud to 115.2k baud. Other
CPU clock frequencies that would give only lower baud rates are not shown.
4. Table entries marked with an asterisk (*) indicate standard crystal and ceramic resonator frequencies that may be obtained from many
sources without special ordering.
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