參數(shù)資料
型號: MC68HC05P4ACDW
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
文件頁數(shù): 62/72頁
文件大小: 400K
代理商: MC68HC05P4ACDW
3.3-Volt Control Timing
MC68HC05P4A Data Sheet, Rev. 7.1
Freescale Semiconductor
65
Figure 12-3. External Interrupt Timing
Figure 12-4. Power-On Reset Timing
ILIH
t
ILIL
t
ILIH
t
IRQ (PIN)
IRQn
IRQ1
RQ (MCU)
NORMALLY
USED WITH
WIRE-ORed
CONNECTION
Edge-Sensitive Trigger Condition
The minimum pulse width (tILIH) is either
125 ns (VDD = 5 V) or 250 ns (VDD = 3 V).
The period tILIL should not be less than
the number of tcyc cycles it takes to
execute the interrupt service routine
plus 19 tcyc cycles.
Level-Sensitive Trigger Condition
If after servicing an interrupt the IRQ
remains low, then the next interrupt is
recognized.
SC1 PIN
VDD
4064
tcyc
INTERNAL
CLOCK
INTERNAL
ADDRESS
BUS
INTERNAL
DATA
BUS
1FFF
1FFE
NEW
PCL
NEW
PCH
1FFE
VDD THRESHOLD (TYPICALLY 1-2 V)
t VDDR
Notes:
1. Internal clock, internal address bus, and internal data bus signals are not available externally.
2. An internal POR reset is triggered as VDD rises through a threshold (typically 1–2 V).
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