saf-xc866-4rri3v Infineon Technologies Corporation, saf-xc866-4rri3v Datasheet - Page 25
saf-xc866-4rri3v
Manufacturer Part Number
saf-xc866-4rri3v
Description
8-bit Single-chip Microcontroller
Manufacturer
Infineon Technologies Corporation
Datasheet
1.SAF-XC866-4RRI3V.pdf
(116 pages)
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3.2.2.2
Address extension is further performed at the module level by paging. With the address
extension by mapping, the XC866 has a 256-SFR address range. However, this is still
less than the total number of SFRs needed by the on-chip peripherals. To meet this
requirement, some peripherals have a built-in local address extension mechanism for
increasing the number of addressable SFRs. The extended address range is not directly
controlled by the CPU instruction itself, but is derived from bit field PAGE in the module
page register MOD_PAGE. Hence, the bit field PAGE must be programmed before
accessing the SFR of the target module. Each module may contain a different number
of pages and a different number of SFRs per page, depending on the specific
requirement. Besides setting the correct RMAP bit value to select the SFR area, the user
must also ensure that a valid PAGE is selected to target the desired SFR. A page inside
the extended address range can be selected as shown in
Figure 9
Data Sheet
Address Extension by Paging
Address Extension by Paging
(to/from CPU)
SFR Address
(from CPU)
SFR Data
rw
MOD_PAGE.PAGE
21
Module
Figure
SFR0
SFR1
SFR0
SFR1
SFR0
SFR1
SFRx
SFRy
SFRz
PAGE 0
PAGE 1
PAGE q
Functional Description
9.
V1.2, 2007-10
XC866
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