XC886/888CLM
Memory Organization
User’s Manual
3-41
V1.3, 2010-02
Memory Organization, V 1.2
3.6
Boot ROM Operating Mode
After a reset, the CPU will always start by executing the Boot ROM code in active
memory map 0. In active memory map 0, the Boot ROM occupies the program memory
address space 0000
H
– 2FFF
H
and C000
H
– EFFF
H
, with the remaining program memory
address space disabled. The Boot ROM start-up procedure will first jump to C00X
H
before switching to active memory map 1 as shown in
ROM memory formerly occupying the address range 0000
H
– 2FFF
H
and C000
H
–
EFFF
H
will be mapped to only C000
H
– EFFF
H
. Also, the remaining program memory
blocks (XRAM, P-Flash and D-Flash) are enabled. After the active memory map switch,
the remaining Boot ROM start-up procedure will be executed from C00X
H
. This includes
checking the latched values of pins MBC, TMS, and P0.0 to enter the selected Boot ROM
operating modes. Refer to
for the selection of different Boot ROM
operating modes. The memory organization of the XC886/888 shown in this document
is after the active memory map switch, i.e. active memory map 1, where the different
operating modes are executed.
ECH
MMWR2
Reset: 00H
Monitor Work Register 2
Bit Field
MMWR2
Type
rw
Table 3-16
OCDS Register Overview
(cont’d)
Addr Register Name
Bit
7
6
5
4
3
2
1
0
*
Содержание XC886CLM
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