參數(shù)資料
型號： M68HC711D0CFB
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, 2 MHz, MICROCONTROLLER, PQFP44
封裝： QFP-44
文件頁數(shù)： 31/124頁
文件大小： 5398K
代理商： M68HC711D0CFB
PIN DESCRIPTIONS
2-2
TECHNICAL DATA
Figure 2-2 Pin Assignments for 40-Pin DIP
2.1 VDD, VSS, and EVSS
Power is supplied to the MCU through VDD and VSS. VSS is the power supply, and
VSS is ground. EVSS, available on the 44-pin PLCC, is an additional ground pin that
must be grounded with VSS. The MCU operates from a single 5-volt (nominal) power
supply. Very fast signal transitions occur on the MCU pins. The short rise and fall times
place high, short duration current demands on the power supply. To prevent noise
problems, provide good power supply bypassing at the MCU. Also, use bypass capac-
itors that have good high-frequency characteristics and situate them as close to the
MCU as possible. Bypass requirements vary, depending on how heavily the MCU pins
are loaded.
2.2 Reset (RESET)
An active low bidirectional control signal, RESET, acts as an input to initialize the MCU
to a known startup state. It also acts as an open-drain output to indicate that an internal
failure has been detected in either the clock monitor or COP watchdog circuit. The
CPU distinguishes between internal and external reset conditions by sensing whether
the reset pin rises to a logic one in less than two E-clock cycles after a reset has oc-
curred. It is not advisable to connect an external resistor-capacitor (RC) power-up de-
lay circuit to the reset pin of M68HC11 devices because the circuit charge time
PC7/ADDR7
XIRQ/VPP
PD7/R/W
PD6/AS
RESET
IRQ
PD0/RxD
PD1/TxD
PD2/MISO
PD3/MOSI
9
10
11
12
13
14
15
16
17
18
PD4/SCK
19
PD5/SS
20
PC6/ADDR6
8
PC5/ADDR5
7
PC4/ADDR4
6
PC3/ADDR3
5
PC2/ADDR2
4
PC1/ADDR1
3
PC0/ADDR0
2
VSS
1
PB5/ADDR13
PB6/ADDR14
PB7/ADDR15
PA0/IC3
PA1/IC2
PA2/IC1
PA3/IC4/OC5/OC1
PA5/OC3/OC1
PA7/PAI/OC1
VDD
30
29
28
27
26
25
24
23
22
21
PB4/ADDR12
31
PB3/ADDR11
32
PB2/ADDR10
33
PB1/ADDR9
34
PB0/ADDR8
35
MODB/VSTBY
36
MODA/LIR
37
E
38
EXTAL
39
XTAL
40
MC68HC(7)11D3
D3 40-PIN DIP
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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