參數(shù)資料
型號(hào)： 935267488112
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, PDSO20
封裝： 7.50 MM, PLASTIC, SO-20
文件頁數(shù)： 39/69頁
文件大?。?/td> 352K
代理商： 935267488112
Philips Semiconductors
Preliminary specification
87LPC768
Low power, low price, low pin count (20 pin) microcontroller with
4 kB OTP 8-bit A/D, Pulse Width Modulator
2000 May 02
42
Table 12. 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 11 AND 12:
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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