參數(shù)資料
型號(hào): MC68HC05P9AVP
廠商: 飛思卡爾半導(dǎo)體(中國)有限公司
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 50/158頁
文件大小: 1106K
代理商: MC68HC05P9AVP
Resets and Interrupts
50
Resets and Interrupts
MOTOROLA
Resets
A reset immediately stops the operation of the instruction being
executed, initializes certain control bits, and loads the program counter
with a user-defined reset vector address. The following sources can
generate resets:
Power-on reset (POR) circuit
RESET pin
COP watchdog
Figure 17. Reset Sources
Power-On Reset
A positive transition on the V
DD
pin generates a power-on reset.
NOTE:
The power-on reset is strictly for power-up conditions and cannot be
used to detect drops in power supply voltage.
A 4064 t
CYC
(internal clock cycle) delay after the oscillator becomes
active allows the clock generator to stabilize. If the RESET pin is at logic
0 at the end of 4064 t
CYC
, the MCU remains in the reset condition until
the signal on the RESET pin goes to logic 1.
D
Q
CK
S
RESET
LATCH
POWER-ON RESET
COP WATCHDOG
(MASK OPTION)
INTERNAL CLOCK
RST
TO CPU AND
SUBSYSTEMS
RESET
V
DD
6-mc68hc05p9a
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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