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參數(shù)資料
| 型號(hào)： | MC68HC05RC16P |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數(shù)： | 39/122頁 |
| 文件大?。?/td> | 2962K |
| 代理商： | MC68HC05RC16P |
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General Description
Signal Description
MC68HC05RC16 — Rev. 3.0
General Release Specification
General Description
1.5.1 VDD and VSS
Power is supplied to the microcontroller’s digital circuits using these two
pins. V
DD is the positive supply and VSS is ground.
1.5.2 IRQ (Maskable Interrupt Request)
In addition to suppling the EPROM with the required programming
voltage, this pin has a mask option as specified by the user that provides
one of two different choices of interrupt triggering sensitivity. The options
are:
1. Negative edge-sensitive triggering only
2. Both negative edge-sensitive and level-sensitive triggering.
The MCU completes the current instruction before it responds to the
interrupt request. When IRQ goes low for at least one t
ILIH (see 11.8
Control Timing (5.0 Vdc and 2.2 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 Section 4. Interrupts for more detail.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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