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MC908QY1VDTE Datasheet(PDF) 32 Page - Freescale Semiconductor, Inc

No. de Pieza. MC908QY1VDTE
Descripción  Microcontrollers
Descarga  184 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC908QY1VDTE Datasheet(HTML) 32 Page - Freescale Semiconductor, Inc

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Memory
MC68HC908QY/QT Family Data Sheet, Rev. 5
32
Freescale Semiconductor
.
2.5 Random-Access Memory (RAM)
Addresses $0080–$00FF are RAM locations. The location of the stack RAM is programmable. The 16-bit
stack pointer allows the stack to be anywhere in the 64-Kbyte memory space.
NOTE
For correct operation, the stack pointer must point only to RAM locations.
Before processing an interrupt, the central processor unit (CPU) uses five bytes of the stack to save the
contents of the CPU registers.
NOTE
For M6805, M146805, and M68HC05 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 may overwrite data in
the RAM during a subroutine or during the interrupt stacking operation.
Table 2-1. Vector Addresses
Vector Priority
Vector
Address
Vector
Lowest
Highest
IF15
$FFDE
ADC conversion complete vector (high)
$FFDF
ADC conversion complete vector (low)
IF14
$FFE0
Keyboard vector (high)
$FFE1
Keyboard vector (low)
IF13
IF6
Not used
IF5
$FFF2
TIM overflow vector (high)
$FFF3
TIM overflow vector (low)
IF4
$FFF4
TIM Channel 1 vector (high)
$FFF5
TIM Channel 1 vector (low)
IF3
$FFF6
TIM Channel 0 vector (high)
$FFF7
TIM Channel 0 vector (low)
IF2
Not used
IF1
$FFFA
IRQ vector (high)
$FFFB
IRQ vector (low)
$FFFC
SWI vector (high)
$FFFD
SWI vector (low)
$FFFE
Reset vector (high)
$FFFF
Reset vector (low)


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