MC68HC908QY4CDW Datasheet, PDF(32/184 Page) Freescale Semiconductor, Inc

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MC68HC908QY4CDW Datasheet, PDF (32/184 Pages) Freescale Semiconductor, Inc – Microcontrollers

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Memory

Vector Priority

Lowest

Highest

Table 2-1. Vector Addresses

Vector

IF15

IF14

IF13

IF6

IF5

IF4

IF3

IF2

IF1

Address

$FFDE

$FFDF

$FFE0

$FFE1

Vector

ADC conversion complete vector (high)

ADC conversion complete vector (low)

Keyboard vector (high)

Keyboard vector (low)

Not used

$FFF2

$FFF3

$FFF4

$FFF5

$FFF6

$FFF7

$FFFA

$FFFB

$FFFC

$FFFD

$FFFE

$FFFF

TIM overflow vector (high)

TIM overflow vector (low)

TIM Channel 1 vector (high)

TIM Channel 1 vector (low)

TIM Channel 0 vector (high)

TIM Channel 0 vector (low)

Not used

IRQ vector (high)

IRQ vector (low)

SWI vector (high)

SWI vector (low)

Reset vector (high)

Reset vector (low)

2.5 Random-Access Memory (RAM)

Addresses $0080â$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.

MC68HC908QY/QT Family Data Sheet, Rev. 6

Freescale Semiconductor

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