參數(shù)資料
型號: MC68HC05E6CDW
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: PLASTIC, SOIC-28
文件頁數(shù): 112/140頁
文件大?。?/td> 1584K
代理商: MC68HC05E6CDW
MC68HC05E6 — Rev. 1.0
Resets and Interrupts
Contents
Resets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Nonmaskable software interrupt (SWI) . . . . . . . . . . . . . . . . . . . . . . . . 78
Maskable hardware interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Hardware controlled interrupt sequence . . . . . . . . . . . . . . . . . . . . . . . 83
The MC68HC05E6 can be reset in four ways: by the initial power-on
reset function, by an active low input to the RESET pin, by a COP
watchdog reset (if the watchdog timer is enabled) and by an opcode
fetch from an illegal address. Any of these resets will cause the program
to go to its starting address, specified by the contents of memory
locations $1FFE and $1FFF, and cause the interrupt mask of the
condition code register to be set.
Power-on reset
A power-on reset occurs when a positive transition is detected on VDD.
The power-on reset function is strictly for power turn-on conditions and
should not be used to detect drops in the power supply voltage. The
power-on circuitry provides a stabilization delay (t
PORL) from when the
oscillator becomes active. If the external RESET pin is low at the end of
this delay then the processor remains in the reset state until RESET
goes high. The user must ensure that the voltage on VDD has risen to a
point where the MCU can operate properly by the time t
PORL has elapsed.
If there is doubt, the external RESET pin should remain low until the
voltage on VDD has reached the specified minimum operating voltage.
This may be accomplished by connecting an external RC circuit to the
1-resets
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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