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CPU System Functions
Caution
(4)
5.
For registers in which byte access is possible, if half word access is
executed:
•
During read operation: The higher 8 bits become undefined.
•
During write operation: The lower 8 bits of data are written to the
register.
1.
Addresses that are not defined as registers are reserved for future
expansion. If these addresses are accessed, the operation is undefined and
not guaranteed.
Programmable peripheral I/O area
The 16 KB area between addresses 03FE C000
provided as a programmable peripheral I/O area (PPA). Within the
microcontroller, the usage and address range of the PPA are not configurable.
The CAN modules registers and message buffers are allocated to the PPA.
Refer to "CAN module register and message buffer addresses" on page 553
for information on how to calculate the register and message buffer addresses
of the CAN modules.
The base address of the PPA is specified by the peripheral area selection
control register (BPC).
• For the microcontroller, the base address of the PPA is fixed to
03FE C000
. Thus writing to BPC.PA[13:0] does not change the PPA base
H
address. Nevertheless the PPA must be enabled by setting BPC.PA15 = 1.
• For the emulation tool, the PPA has to be enabled and the base address
has to be set up by writing 8FFB
To make software suitable for both microcontroller and emulation tool, it is
recommended to include the set up of the PPA with BPC = 8FFB
software.
User's Manual U18743EE1V2UM00
and 03FE EFFF
H
to the BPC register.
H
Chapter 3
is
H
in the
H
153
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