參數(shù)資料
型號: MC68HC705RC16P
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 35/120頁
文件大?。?/td> 547K
代理商: MC68HC705RC16P
General Description
Signal Description
MC68HC705RC16 Rev. 3.0
General Release Specification
MOTOROLA
General Description
21
NON-DISCLOSURE
AGREEMENT
REQUIRED
The MCU completes the current instruction before it responds to the
interrupt request. When IRQ goes low for at least one t
Control Timing (5.0 Vdc and 3.3 Vdc)), a logic 1 is latched internally to
signify that an interrupt has been requested. When the MCU completes
its current instruction, the interrupt latch is tested. If the interrupt latch
contains a logic 1 and the interrupt mask bit (I bit) in the condition code
register is clear, the MCU then begins the interrupt sequence.
If the option is selected to include level-sensitive triggering, the IRQ input
requires an external resistor to V
DD for wired-OR operation.
The IRQ pin contains an internal Schmitt trigger as part of its input to
improve noise immunity.
Refer to 4.2 Introduction for more detail.
1.5.3 OSC1 and OSC2
These pins provide control input for an on-chip clock oscillator circuit. A
crystal, a ceramic resonator, or an external signal connects to these pins
to provide a system clock. The oscillator frequency is two times the
internal bus rate.
Figure 1-5 shows the recommended circuit when using a crystal. The
crystal and components should be mounted as close as possible to the
input pins to minimize output distortion and startup stabilization time.
A ceramic resonator may be used in place of the crystal in cost-sensitive
applications. Figure 1-5 (a) shows the recommended circuit for using a
ceramic resonator. The manufacturer of the particular ceramic resonator
being considered should be consulted for specific information.
An external clock should be applied to the OSC1 input with the OSC2 pin
not connected (see Figure 1-5 (b)). This setup can be used if the user
does not want to run the CPU with a crystal.
相關(guān)PDF資料
PDF描述
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