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参数资料
型号： MC68HRC705JP7CP
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, PDIP28
封装： PLASTIC, DIP-28
文件页数： 84/164页
文件大小： 1165K
代理商： MC68HRC705JP7CP
Memory
MC68HC705JJ7 MC68HC705JP7 Advance Information Data Sheet, Rev. 4.1
26
Freescale Semiconductor
2.4 User and Interrupt Vector Mapping
The interrupt vectors are contained in the upper memory addresses above $1FF0 as shown in Figure 2-4.
2.5 Random-Access Memory (RAM)
The 224 addresses from $0020 to $00FF serve as both the user RAM and the stack RAM. The central
processor unit (CPU) uses five RAM bytes to save all CPU register contents before processing an
interrupt. During a subroutine call, the CPU uses two bytes to store the return address. The stack pointer
decrements during pushes and increments during pulls.
NOTE
Be careful when using nested subroutines or multiple interrupt levels. The
CPU may overwrite data in the RAM during a subroutine or during the
interrupt stacking operation.
2.6 Erasable Programmable Read-Only Memory (EPROM)
The EPROM is located in three areas of the memory map:
Addresses $0700–$1EFF contain 6144 bytes of user EPROM.
Addresses $1FF0–$1FF1 contain 2 bytes of EPROM reserved for user vectors and COP and
security register (COPR), and the mask option register. Only bit 7 of $1FF0 is a programmable bit.
Addresses $1FF2–$1FFF contain 14 bytes of interrupt vectors.
Address
Register Name
$1FF0
COP Register and EPROM Security
$1FF1
Mask Option Register
$1FF2
Analog Interrupt Vector (MSB)
$1FF3
Analog Interrupt Vector (LSB)
$1FF4
Serial Interrupt Vector (MSB)
$1FF5
Serial Interrupt Vector ((LSB)
$1FF6
Timer Interrupt Vector (MSB)
$1FF7
Timer Interrupt Vector (LSB)
$1FF8
Core Timer Interrupt Vector (MSB)
$1FF9
Core Timer Interrupt Vector (LSB)
$1FFA
External IRQ Vector (MSB)
$1FFB
External IRQ Vector (LSB)
$1FFC
SWI Vector (MSB)
$1FFD
SWI Vector (LSB)
$1FFE
Reset Vector (MSB)
$1FFF
Reset Vector (LSB)
Figure 2-4. Vector Mapping
相关PDF资料
PDF描述
MC68HC705SP7CP 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP28
MC68HC705JP7CDW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO28
MC68HC705JJ7CDW 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
MC68HC705JJ7CP 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDIP20
MC68HC705JJ7S 8-BIT, UVPROM, 2.1 MHz, MICROCONTROLLER, CDIP20
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