参数资料
型号: MC68HC908RK2DW
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 4 MHz, MICROCONTROLLER, PDSO20
封装: PLASTIC, SOIC-20
文件页数: 80/158页
文件大小: 1020K
代理商: MC68HC908RK2DW
Memory
MC68HC908RK2 Data Sheet, Rev. 5.1
28
Freescale Semiconductor
Table 2-1 is a list of vector locations.
2.3 Monitor ROM
The 768 bytes at addresses $F000–F2EF and $FEF0–$FEFF are utilized by the monitor ROM.
The address range $F000–F2EF is reserved for the monitor code functions, FLASH memory
programming, and erase algorithms.
The address range $FEF0–$FEFF holds reserved ROM addresses that contain the monitor code reset
vectors.
2.4 Random-Access Memory (RAM)
Addresses $0080–$00FF are RAM locations. The location of the stack RAM is programmable.
NOTE
For correct operation, the stack pointer must point only to RAM locations.
Before processing an interrupt, the CPU uses five bytes of the stack to save the contents of the CPU
registers.
NOTE
For M68HC05, M6805, and M146805 compatibility, the H register is not
stacked.
During a subroutine call, the CPU uses two bytes of the stack to store the return address. The stack
pointer decrements during pushes and increments during pulls.
NOTE
Be careful when using nested subroutines. The CPU could overwrite data
in the RAM during a subroutine or during the interrupt stacking operation.
Table 2-1. Vector Locations
Address
Vector
Lo
w
$FFF2
ICG vector (high)
$FFF3
ICG vector (low)
Pr
ior
it
y
$FFF4
TIM overflow vector (high)
$FFF5
TIM overflow vector (low)
$FFF6
TIM channel 1 vector (high)
$FFF7
TIM channel 1 vector (low)
$FFF8
TIM channel 0 vector (high)
$FFF9
TIM channel 0 vector (low)
$FFFA
IRQ/keyboard vector (high)
$FFFB
IRQ/keyboard vector (low)
$FFFC
SWI vector (high)
$FFFD
SWI vector (low)
High
$FFFE
Reset vector (high)
$FFFF
Reset vector (low)
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