參數(shù)資料
型號: MC68HC05E5P
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, PDIP28
封裝: PLASTIC, DIP-28
文件頁數(shù): 72/140頁
文件大小: 847K
代理商: MC68HC05E5P
Interrupts
Custom Periodic Interrupt (CPI)
MC68HC05E5 Rev. 1.0
General Release Specification
MOTOROLA
Interrupts
37
NON-DISCLOSURE
AGREEMENT
REQUIRED
4.7 Custom Periodic Interrupt (CPI)
The CPI flag and enable bits are located in the CPI control and status
register (CPICSR). A CPI interrupt will vector to the interrupt service
routine located at the address specified by the contents of memory
location $1FF6 and $1FF7.
The custom periodic interrupt is mask programmable to a 0.25 second,
0.5 second, or 1 second interrupt. The interrupt is generated from the
32-kHz OSC1 input by a 15-bit counter. This interrupt is under the
control of the custom periodic interrupt control and status register
located at $12.
CPIF — Custom Periodic Interrupt Flag
CPIF is a clearable, read-only status bit and is set when the 15-bit
counter changes from $7FFF to $0000. A CPU interrupt request will
be generated if CPIE is set. Clearing the CPIF is done by writing a
zero to it. Writing a one to CPIF has no effect on the bit’s value. Reset
clears CPIF.
CPIE — Custom Periodic Interrupt Enable
When this bit is cleared, the CPI interrupts are disabled. When this bit
is set, the CPU interrupt request is generated when the CPIF bit is set.
Reset clears this bit.
Address
$0012
Bit 7
654321
Bit 0
Read:
0
CPIF
0
CPIE
0000
Write:
Reset:
00000000
Figure 4-3. Custom Periodic Interrupt Control
and Status Register (CPICSR)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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