參數(shù)資料
型號： MC68HC16Z1VEH16
廠商： Freescale Semiconductor
文件頁數(shù)： 6/56頁
文件大?。?/td> 0K
描述： IC MCU 16BIT 1K FLASH 132-PQFP
標(biāo)準(zhǔn)包裝： 36
系列： HC16
核心處理器： CPU16
芯體尺寸： 16-位
速度： 16MHz
連通性： EBI/EMI，SCI，SPI
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 16
程序存儲器類型： ROMless
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 5.5 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 ~ 105°C
封裝/外殼： 132-BQFP 緩沖式
包裝： 托盤
MC68HC16Z1TUT/D
Figure 8 RESET Waveform Caused by Weak Pull-Up
If the PLL circuit is not used, and an external clock at the desired frequency of the system clock is ap-
plied to EXTAL prior to start-up, the start up sequence is the same except that the MCU recognizes the
clock immediately instead of waiting for the PLL to lock.
2.7 Power Supply
Always connect all power and ground pins to power sources. Internal power buses only serve about 8
– 10 pins each. The power and ground pins are usually not connected together within the device. If any
power pin is left floating, the pins served by the floating power pin can receive power from internal cir-
cuitry such as internal protection diodes. However, the current path will usually have several diode
drops resulting in a low output high voltage (about 3 volts) on associated output pins.
2.7.1 Low Voltage Inhibit Devices
A low voltage inhibit (LVI) device (also referred to as a reset supervisor circuit) protects the MCU by
keeping it in reset until full voltage is applied and by forcing an external reset as soon as power starts
to fall. This prevents the MCU from going into an indeterminate state due to a power supply failure or
slow power supply ramp-up time. It is a good idea to use an LVI device since the MCU is not guaranteed
to stay in reset when power is below VDD. In fact the actual voltage level that causes the MCU to go into
reset is not a specified parameter, and the MCU may continue to try to operate even when power dips
below VDD.
A number of manufacturers make LVI devices that can be used with the MCU.
Analog Devices — (617) 461-3392
LVI part numbers are ADM698 and ADM699. These devices require pull-up resistors.
Dallas Semiconductor — (214) 450-0448
Various reset supervisor circuits. Part numbers DS1233A, D, and M do not require pull-up resistors.
Linear Technologies — (408) 432-1900
LVI part numbers are LTC692 and LTC693. These devices require a pull-up resistor.
Maxim — (800) 998-8800 or (408) 737-7600
Various reset supervisor circuits. MAX 690 and MAX 700 series devices require pull-up resistors, but
MAX 809 devices do not.
Freescale Semiconductor, Inc. — (408) 432-1900
One reset supervisor circuit part number is MC34064. It requires an external pull-up resistor.
332TUT RESET LEVEL TIM
0 VOLTS
5 VOLTS
INDETERMINATE
LOGIC LEVEL
512 SYSTEM CLOCKS
10 OR 14 SYSTEM CLOCKS
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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