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參數(shù)資料
| 型號： | 87LPC762 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Low power, low price, low pin count 20 pin microcontroller with 2 kbyte OTP |
| 中文描述： | 低功耗，低價(jià)格，低管腳數(shù)的2字節(jié)OTP 20引腳微控制器 |
| 文件頁數(shù)： | 36/57頁 |
| 文件大?。?/td> | 312K |
| 代理商： | 87LPC762 |
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Philips Semiconductors
Preliminary data
87LPC762
Low power, low price, low pin count (20 pin)
microcontroller with 2 kbyte OTP
2001 Oct 26
33
Baud Rates
The baud rate in Mode 0 is fixed: Mode 0 Baud Rate = CPU clock/6.
The baud rate in Mode 2 depends on the value of bit SMOD1 in
Special Function Register PCON. If SMOD1 = 0 (which is the value
on reset), the baud rate is 1/32 of the CPU clock frequency. If
SMOD1 = 1, the baud rate is 1/16 of the CPU clock frequency.
Mode 2 Baud Rate
1
SMOD1
32
x CPU clock frequency
Using Timer 1 to Generate Baud Rates
When Timer 1 is used as the baud rate generator, the baud rates in
Modes 1 and 3 are determined by the Timer 1 overflow rate and the
value of SMOD1. The Timer 1 interrupt should be disabled in this
application. The Timer itself can be configured for either “timer” or
“counter” operation, and in any of its 3 running modes. In the most
typical applications, it is configured for “timer” operation, in the
auto-reload mode (high nibble of TMOD = 0010b). In that case the
baud rate is given by the formula:
Mode 1, 3 Baud Rate
CPU clock frequency
192 (or 96 if SMOD1
1)
256
(TH1)
Tables 6 and 7 list various commonly used baud rates and how they
can be obtained using Timer 1 as the baud rate generator.
Table 9. Baud Rates, Timer Values, and CPU Clock Frequencies for SMOD1 = 0
Timer Co nt
Timer Count
Baud Rate
2400
0.4608
4800
0.9216
9600
* 1.8432
19.2k
* 3.6864
38.4k
* 7.3728
57.6k
* 11.0592
–1
–2
0.9216
1.8432
* 3.6864
* 7.3728
* 14.7456
–3
1.3824
2.7648
5.5296
* 11.0592
–
–
–4
* 1.8432
* 3.6864
* 7.3728
* 14.7456
–
–
–5
2.3040
4.6080
9.2160
* 18.4320
–
–
–6
2.7648
5.5296
* 11.0592
–
–
–
–7
3.2256
6.4512
12.9024
–
–
–
–8
* 3.6864
* 7.3728
* 14.7456
–
–
–
–9
4.1472
8.2944
16.5888
–
–
–
–10
4.6080
9.2160
* 18.4320
–
–
–
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