XC888LM datasheet(32/144 Pages) INFINEON

32 / 144 page

XC886/888CLM

Functional Description

Data Sheet

V0.9, 2006-12

Note: The RMAP bit should be cleared/set by ANL or ORL instructions.

3.2.2.2

Address Extension by Paging

Address extension is further performed at the module level by paging. With the address

extension by mapping, the XC886/888 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.

SYSCON0

System Control Register 0

Reset Value: 04

76543210

IMODE

RMAP

rrr

Field

Bits

Type Description

RMAP

0rw

Interrupt Node XINTR0 Enable

The access to the standard SFR area is

enabled

The access to the mapped SFR area is

enabled

Reserved

Returns 1 if read; should be written with 1.

[7:5],

3,1

Reserved

Returns 0 if read; should be written with 0.

XC888LM Datasheet(PDF) 32 Page - Infineon Technologies AG

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