參數(shù)資料
型號: C8051F018
廠商: Silicon Laboratories Inc
文件頁數(shù): 21/154頁
文件大小: 0K
描述: IC 8051 MCU 16K FLASH 64TQFP
標(biāo)準(zhǔn)包裝: 160
系列: C8051F018
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SMBus(2 線/I²C),SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,溫度傳感器,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-TQFP
包裝: 托盤
C8051F018
C8051F019
16.1.3. Mode 2: 9-Bit UART, Fixed Baud Rate
Mode 2 provides asynchronous, full-duplex communication using a total of eleven bits per data byte: a start bit, 8
data bits (LSB first), a programmable ninth data bit, and a stop bit (see timing diagram in Figure 16.6). On transmit,
the ninth data bit is determined by the value in TB8 (SCON.3). It can be assigned the value of the parity flag P in
the PSW or used in multiprocessor communications. On receive, the ninth data bit goes into RB8 (SCON.2) and the
stop bit is ignored.
Data transmission begins when an instruction writes a data byte to the SBUF register. The TI Transmit Interrupt
Flag (SCON.1) is set at the end of the transmission (the beginning of the stop-bit time). Data reception can begin
any time after the REN Receive Enable bit (SCON.4) is set to logic 1. After the stop bit is received, the data byte
will be loaded into the SBUF receive register if the following conditions are met: RI must be logic 0, and if SM2 is
logic 1, the 9
th bit must be logic 1.
If these conditions are met, the eight bits of data are stored in SBUF, the ninth bit is stored in RB8 and the RI flag is
set. If these conditions are not met, SBUF and RB8 will not be loaded and the RI flag will not be set. An interrupt
will occur if enabled when either TI or RI are set.
The baud rate in Mode 2 is a direct function of the system clock frequency as follows:
Mode 2 Baud Rate = 2
SMOD * (SYSCLK / 64).
The SMOD bit (PCON.7) selects whether to divide SYSCLK by 32 or 64. In the formula, 2 is raised to the power
SMOD, resulting in a baud rate of either 1/32 or 1/64 of the system clock frequency. On reset, the SMOD bit is
logic 0, thus selecting the lower speed baud rate by default.
Figure 16.6. UART Modes 2 and 3 Timing Diagram
D1
D0
D2
D3
D4
D5
D6
D7
START
BIT
MARK
STOP
BIT
BIT TIMES
BIT SAMPLING
SPACE
D8
16.1.4. Mode 3: 9-Bit UART, Variable Baud Rate
Mode 3 is the same as Mode 2 in all respects except the baud rate is variable. The baud rate is determined in the
same manner as for Mode 1. Mode 3 operation transmits 11 bits: a start bit, 8 data bits (LSB first), a programmable
ninth data bit, and a stop bit. Timer 1 or Timer 2 overflows generate the baud rate just as with Mode 1. In
summary, Mode 3 transmits using the same protocol as Mode 2 but with Mode 1 baud rate generation.
117
Rev. 1.2
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C8051F018-GQR 功能描述:8位微控制器 -MCU 16KB 10ADC 64Pin MCU Tape and Reel RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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C8051F019 功能描述:8位微控制器 -MCU 16KB 10ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT
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