参数资料
型号: P87LPC764BDH,518
厂商: NXP Semiconductors
文件页数: 28/60页
文件大小: 0K
描述: IC 80C51 MCU 4K OTP 20-TSSOP
标准包装: 2,500
系列: LPC700
核心处理器: 8051
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,UART/USART
外围设备: 欠压检测/复位,LED,POR,WDT
输入/输出数: 18
程序存储器容量: 4KB(4K x 8)
程序存储器类型: OTP
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 6 V
振荡器型: 内部
工作温度: 0°C ~ 70°C
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)
包装: 带卷 (TR)
其它名称: P87LPC764BDH518
Philips Semiconductors
Product data
P87LPC764
Low power, low price, low pin count (20 pin)
microcontroller with 4 kbyte OTP
2003 Sep 03
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
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 (or96ifSMOD1
+ 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
Baud Rate
Timer Count
2400
4800
9600
19.2k
38.4k
57.6k
–1
0.4608
0.9216
* 1.8432
* 3.6864
* 7.3728
* 11.0592
–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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