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| 型號(hào)： | MC68HC05E5DW |
| 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, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁(yè)數(shù)： | 52/140頁(yè) |
| 文件大小： | 847K |
| 代理商： | MC68HC05E5DW |
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General Description
Functional Pin Description
MC68HC05E5 — Rev. 1.0
General Release Specification
MOTOROLA
General Description
19
NON-DISCLOSURE
AGREEMENT
REQUIRED
1.5.1 V
DD
and V
SS
Power is supplied to the microcontroller using these two pins. V
DD is the
positive supply and V
SS is ground.
1.5.2 IRQ
The maskable interrupt request (IRQ) has a programmable option that
provides 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 tILIH, a logic 1 is
latched internally to signify 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 VDD 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.
NOTE:
The voltage on the IRQ pin affects the mode of operation. For additional
information, see Section 6. Operating Modes.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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