参数资料
型号: MC68HC05SB7
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: MO-150, SSOP-28
文件页数: 90/170页
文件大小: 2161K
代理商: MC68HC05SB7
GENERAL RELEASE SPECIFICATION
August 27, 1998
MOTOROLA
MEMORY
MC68HC05SB7
2-6
REV 2.1
2.3
INTERRUPT VECTOR MAPPING
The interrupt vectors are contained in the upper memory addresses above $1FF0
as shown in Figure 2-2.
2.4
ROM
There are a total of 6160 bytes of ROM on chip. This includes 6144 bytes of user
ROM with locations $0600 through $1DFF for the user program storage and
another 16 bytes for user vectors at locations $1FF0 through $1FFF.
2.5
RAM
The 224 addresses from $0040 to $011F serve as both the user RAM and the
stack RAM. The stack begins at address $00C0 and proceeds down to $00FF.
The stack pointer can access 64 locations from $00C0 to $00FF. Using the stack
area for data storage or temporary work locations requires care to prevent it from
being over written due to stacking from an interrupt or subroutine call. The CPU
uses ve RAM bytes to save all CPU register contents before processing an inter-
rupt. 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.
Addr.
Register Name
$1FF0
CDET INTERRUPT VECTOR (MSB)
$1FF1
CDET INTERRUPT VECTOR (LSB)
$1FF2
ANALOG INTERRUPT VECTOR (MSB)
$1FF3
ANALOG INTERRUPT VECTOR (LSB)
$1FF4
SM-BUS INTERRUPT VECTOR (MSB)
$1FF5
SM-BUS INTERRUPT VECTOR (LSB)
$1FF6
TIMER INTERRUPT VECTOR (MSB)
$1FF7
TIMER INTERRUPT VECTOR (LSB)
$1FF8
CTIMER INTERRUPT VECTOR (MSB)
$1FF9
CTIMER 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 2-7. MC68HC05SB7 Interrupt Vector Mapping
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