參數資料
型號: PIC18F85J50-I/PT
廠商: Microchip Technology
文件頁數: 33/61頁
文件大小: 0K
描述: IC PIC MCU FLASH 16KX16 80TQFP
產品培訓模塊: Asynchronous Stimulus
PIC18 J Series MCU Overview
8-bit PIC® Microcontroller Portfolio
標準包裝: 119
系列: PIC® 18F
核心處理器: PIC
芯體尺寸: 8-位
速度: 48MHz
連通性: EBI/EMI,I²C,SPI,UART/USART,USB
外圍設備: 欠壓檢測/復位,LVD,POR,PWM,WDT
輸入/輸出數: 65
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: 閃存
RAM 容量: 3.8K x 8
電壓 - 電源 (Vcc/Vdd): 2 V ~ 3.6 V
數據轉換器: A/D 12x10b
振蕩器型: 內部
工作溫度: -40°C ~ 85°C
封裝/外殼: 80-TQFP
包裝: 托盤
產品目錄頁面: 643 (CN2011-ZH PDF)
配用: AC162087-ND - HEADER MPLAB ICD2 18F87J50 68/84
MA180021-ND - MODULE PLUG-IN 18F87J50 FS USB
AC164328-ND - MODULE SKT FOR 80TQFP
Philips Semiconductors
Product data
P87LPC767
Low power, low price, low pin count (20 pin)
microcontroller with 4-kbyte OTP and 8-bit A/D converter
2002 Mar 25
36
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 10. 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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