參數(shù)資料
型號: MC68HC705JB2P
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, PDIP20
封裝: PLASTIC, DIP-20
文件頁數(shù): 106/128頁
文件大小: 2493K
代理商: MC68HC705JB2P
August 28, 1998
GENERAL RELEASE SPECIFICATION
UNIVERSAL SERIAL BUS MODULE
REV 1.1
10-11
10.3
CLOCK REQUIREMENTS
The low speed data rate is nominally 1.5 Mbs. The OSCXCLK signal driven by the
oscillator circuits is the clock source for the USB module and requires that a 6
MHz oscillator circuit be connected to the OSC1 and OSC2 pins. The permitted
frequency tolerance for low speed functions is approximately
±1.5% (15000 ppm).
This tolerance includes inaccuracies from all sources: initial frequency accuracy,
crystal capacitive loading, supply voltage on the oscillator, temperature, and
aging. The jitter in the low speed data rate must be less than 10 ns. This tolerance
allows the use of resonators in low cost, low speed devices.
10.4
HARDWARE DESCRIPTION
The USB module as previously shown in Figure 10-1 contains four functional
blocks: a 3.3 volt Regulator, a LS USB transceiver, the USB control logic, and the
USB registers. The following will detail the function of the regulator, transceiver
and control logic. See Section 10.5 for the register discussion.
10.4.1 Voltage Regulator
The USB data lines are required by the USB Specication to have a maximum
output voltage between 2.8V and 3.6V. The data lines are also required to have an
external 1.5K
pullup resistor connected between a data line and a voltage
source between 3.0V and 3.6V. Since the power provided by the USB cable is
specied to be between 4.4V and 5.0V, an on-chip regulator is used to drop the
voltage to the appropriate level for sourcing the USB transceiver and external
pullup resistor. An output pin driven by the regulator voltage is provided to source
the 1.5K
external resistor. Figure 10-11 shows the worst case electrical
connection for the voltage regulator.
Figure 10-11. Regulator Electrical Connections
LS
Transceiver
3.3V
R2
R1
R1 = 1.5K
±5%
R2 = 15K
±5%
Regulator
USB Data Lines
Host
or
Hub
USB Cable
4.4V
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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