參數(shù)資料
型號: MC68HC705E5P
廠商: FREESCALE SEMICONDUCTOR 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): 63/148頁
文件大?。?/td> 3554K
代理商: MC68HC705E5P
General Description
Functional Pin Description
MC68HC705E5 Rev. 1.0
General Release Specification
General Description
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/VPP
This pin is used to supply the EPROM with the required programming
voltage. In addition, the mask interrupt request 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/VPP 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/VPP 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
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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