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參數(shù)資料
| 型號： | MC68HC05JB3JDW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 59/148頁 |
| 文件大?。?/td> | 1600K |
| 代理商： | MC68HC05JB3JDW |
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GENERAL RELEASE SPECIFICATION
November 5, 1998
MOTOROLA
GENERAL DESCRIPTION
MC68HC05JB3
1-6
REV 1
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 1-3(b).This
conguration is possible ONLY when the crystal/ceramic resonator mask option is
selected.
1.4.3 RESET
This is an I/O pin. This pin can be used as an input to reset the MCU to a known
start-up state by pulling it to the low state. The RESET pin contains a steering
diode to discharge any voltage on the pin to VDD, when the power is removed. An
internal pull-up is also connected between this pin and VDD. The RESET pin con-
tains an internal Schmitt trigger to improve its noise immunity as an input. This pin
is an output pin if LVR triggers an internal reset.
1.4.4 IRQ
This input pin drives the asynchronous IRQ interrupt function of the CPU. The IRQ
interrupt function has a mask option to provide either only negative edge-sensitive
triggering or both negative edge-sensitive and low level-sensitive triggering. If the
option is selected to include level-sensitive triggering, the IRQ input requires an
external resistor to VDD for "wired-OR" operation, if desired. The IRQ pin contains
an internal Schmitt trigger as part of its input to improve noise immunity.
NOTE
Each of the PA0 to PA3 I/O pins may be connected as an OR function with the IRQ
interrupt function by a mask option. This capability allows keyboard scan
applications where the transitions or levels on the I/O pins will behave the same
as the IRQ pin. The edge or level sensitivity selected by a separate mask option
for the IRQ pin also applies to the I/O pins OR’ed to create the IRQ signal.
1.4.5 3.3V
This is an output reference voltage nominally set at 3.3V dc.
1.4.6 D+ and D–
These two lines carry the USB differential data. For low speed device such as
MC68HC05JB3, a 1.5 k
resistor is required to be connected across D– and 3.3V
for proper signal termination.
1.4.7 PA0-PA7
These eight I/O lines comprise Port A. PA0 to PA7 are push-pull pins with pull-
down devices. The state of any pin is software programmable and all Port A lines
are congured as inputs during power-on or reset.
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