參數(shù)資料
型號(hào)： MC68HC16Z1VEH16
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 54/56頁(yè)
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(chǔ)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(pán)
2. Hold DATA9 high during reset as described in 2.1 Using Data Bus Pins to Configure the MCU
to assign all these pins for use as interrupt-request inputs. Pull up all lines that are to be used for
interrupt service, including IRQ7, to 5 V via 10 K
resistors, hold DATA9 high during reset, re-
assign the pins that are not used for interrupt requests by writing to the port F pin assignment
register, then change the IPL mask value to enable maskable interrupts.
Remember that the level 7 interrupt is non-maskable — when configured as an interrupt line, IRQ7 is
always enabled. The only way to disable external IRQ7 interrupts is to assign the IRQ7 pin to I/O func-
tion via the port F pin assignment register.
DSACK[0:1] — During bus transfers, external devices can drive these signals to indicate port width.
These signals are active even if the bus transfer is to or from a peripheral that is using one of the chip-
selects to terminate the bus cycle. Putting 10 K
pull-ups on these two pins prevents accidental asser-
tion of DSACK[0:1], which can occur if the pins are left oating.
AVEC — If this signal is asserted during an interrupt acknowledge cycle, an autovector will be used for
the external interrupt being serviced. If the AVEC pin is connected permanently to ground, all external
interrupts will autovector. Using a 10 K
pull-up resistor will prevent unexpected assertion of the AVEC
pin.
TSTME/TSC — The inactive state of this pin is 5 Volts. Pulling it low enables special test mode, but the
MCU cannot enter test mode unless the state of a bit in one of the test mode registers is changed by
the software. Although this should happen only if the software is corrupted, to prevent entering special
test mode, put a 10 K
pull-up resistor on this pin. Special test mode is generally used only for factory
testing. Driving this pin to approximately 1.6 times VDD causes the MCU to place all output drivers in a
high-impedance state, isolating the MCU from the rest of the system.
BKPT/DSCLK — Background debug mode (BDM) operation is enabled when BKPT is asserted at the
rising edge of the RESET signal. BDM remains enabled until the next system reset. If BKPT is at a logic
level one on the trailing edge of RESET, BDM is disabled. BKPT is re-latched on each rising transition
of RESET. A 4.7 K
pull-up resistor will ensure that BDM is not unexpectedly enabled upon reset.
R/W — Putting a 10 K
pull-up resistor on this pin will prevent accidental writes to memory while the
device is being powered up. Normally, R/W is always defined. However, when power is first applied to
the device, R/W can be undefined for a few cycles. This may cause a problem for EEPROM or battery
backed up RAM.
RESET — An 820
pull-up resistor is required for this pin. Do not put capacitors on the RESET pin.
The reason for such a strong pull-up and no extra capacitance is that the RESET line must rise to a
logic 1 within approximately10 system clocks after the MCU has driven RESET low for 512 clocks, or
else the MCU re-asserts the RESET line for an additional 512 clock cycles.
MODCLK — If using the internal PLL to generate the system clock, this pin must be pulled up with a 10
K
resistor or driven high during reset. If using an external clock source and bypassing the PLL, con-
nect this pin to ground or drive it low during reset.
2.4 Using Sockets
Because of the high pin count the MCU package has a very narrow lead pitch, which makes it nearly
impossible to hand-solder onto a board. This is not a problem for design activities that can manufacture
PC boards, but designers who are assembling a limited number of prototypes or who cannot manufac-
ture PC boards will probably need to use a socket to hold the chip. The wider spacing of socket pins
makes it possible to connect the socket to a board.
Sockets are not a place to economize. Use a good quality socket that firmly holds the MCU in place so
that all pins maintain contact. If the MCU is likely to be removed and replaced, consider using a zero
insertion force socket.
Three socket manufacturers are:
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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