參數(shù)資料
型號(hào)： 68HC05M68HC
廠商： Motorola, Inc.
英文描述： HCMOS Microcontroller Unit
中文描述： HCMOS微控制器
文件頁數(shù)： 24/130頁
文件大小： 1541K
代理商： 68HC05M68HC
General Description
Advance Information
MC68HC705P6A
—
Rev. 2.0
24
General Description
MOTOROLA
1.4.2.3 External Clock
An external clock from another CMOS-compatible device can be
connected to the OSC1 input, with the OSC2 input not connected, as
shown in
Figure 1-2
(b)
.
1.4.3 RESET
Driving this input low will reset the MCU to a known startup state. The
RESET pin contains an internal Schmitt trigger to improve its noise
immunity. Refer to
Section 4. Resets
.
1.4.4 PA0
–
PA7
These eight I/O pins comprise port A. The state of any pin is software
programmable and all port A lines are configured as inputs during
power-on or reset. Port A has mask-option register enabled interrupt
capability with internal pullup devices selectable for any pin. Refer to
Section 6. Input/Output Ports
.
1.4.5 PB5/SDO, PB6/SDI, and PB7/SCK
These three I/O pins comprise port B and are shared with the SIOP
communications subsystem. The state of any pin is software
programmable, and all port B lines are configured as inputs during
power-on or reset. Refer to
Section 6. Input/Output Ports
and
Section 7. Serial Input/Output Port (SIOP)
.
1.4.6 PC0-PC2, PC3/AD3, PC4/AD2, PC5/AD1, PC6/AD0, and PC7/V
REFH
These eight I/O pins comprise port C and are shared with the A/D
converter subsystem. The state of any pin is software programmable
and all port C lines are configured as inputs during power-on or reset.
Refer to
Section 6. Input/Output Ports
and
Section 9. Analog
Subsystem
.
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