参数资料
型号: MC68HC705J1AVP
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP20
封装: PLASTIC, DIP-20
文件页数: 88/162页
文件大小: 3213K
代理商: MC68HC705J1AVP
General Description
IRQ/VPP
MC68HC705J1A — Rev. 4.0
Technical Data
General Description
1.7 IRQ/VPP
The external interrupt/programming voltage pin (IRQ/VPP) drives the
asynchronous IRQ interrupt function of the CPU. Additionally, it is used
to program the user EPROM and mask option register. (See Section 2.
The LEVEL bit in the mask option register provides negative
edge-sensitive triggering or both negative edge-sensitive and low
level-sensitive triggering for the interrupt function.
If level-sensitive triggering is selected, the IRQ/VPP input requires an
external resistor to VDD for wired-OR operation. If the IRQ/VPP pin is not
used, it must be tied to the VDD supply.
The IRQ/VPP pin contains an internal Schmitt trigger as part of its input
to improve noise immunity. The voltage on this pin should not exceed
VDD except when the pin is being used for programming the EPROM.
NOTE:
The mask option register can enable the PA0–PA3 pins to function as
external interrupt pins.
1.8 PA0–PA7
These eight input/output (I/O) lines comprise port A, a general-purpose,
bidirectional I/O port. See Section 8. External Interrupt Module (IRQ)
for information on PA0–PA3 external interrupts.
1.9 PB0–PB5
These six I/O lines comprise port B, a general-purpose, bidirectional I/O
port.
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For More Information On This Product,
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