XC886/888CLM
Memory Organization
User’s Manual
3-17
V1.3, 2010-02
Memory Organization, V 1.2
3.5.4
System Control Registers
The system control SFRs are used to control the overall system functionalities, such as
interrupts, variable baud rate generation, clock management, bit protection scheme,
oscillator and PLL control. The SFRs are located in the standard memory area
(RMAP = 0) and are organized into 2 pages. The SCU_PAGE register is located at BF
H
.
It contains the page value and page control information.
SCU_PAGE
Page Register for System Control
Reset Value: 00
H
7
6
5
4
3
2
1
0
OP
STNR
0
PAGE
w
w
r
rw
Field
Bits
Type Description
PAGE
[2:0]
rw
Page Bits
When written, the value indicates the new page.
When read, the value indicates the currently active
page.
STNR
[5:4]
w
Storage Number
This number indicates which storage bit field is the
target of the operation defined by bit field OP.
If OP = 10
B
,
the contents of PAGE are saved in STx before being
overwritten with the new value.
If OP = 11
B
,
the contents of PAGE are overwritten by the
contents of STx. The value written to the bit positions
of PAGE is ignored.
00
ST0 is selected.
01
ST1 is selected.
10
ST2 is selected.
11
ST3 is selected.
*