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Applications Engineering
6.3 Memory Map
The amount and memory locations of the kernel, to communicate with the KD30 and ICD, are
using on the M16C/26A on the SKP16C26A board is shown on Figure 6-2.
00000h
00400h
00BFFh
0F000h
0F800h
10000h
SFR Area
Internal RAM
Area - 2kB
Reserved
High E/W
2kB data block
High E/W
2kB data block
User RAM Area
= 1920 Bytes
Kernel RAM
(128 Bytes)
0B7Fh
0BFFh
Note: User programs must
not use shaded areas.
Reserved
User Program
Area - 62KB
F0000h
FFFFFh
Flash ROM
Area - 64KB
FF900h
FFE80h
Kernel
Program
FFFDCh
Special Page
Area
Fixed Vector
Area
Figure 6-2 M30260F8GP Memory Map with the Kernel Program
Note: The kernel occupies memory associated with special-page vector numbers 18-19 and 192-
255. The user reset vector is re-mapped to address FFFD8h by the kernel.
6.4 Register Operation Limitations
Table 6-3 lists the limitations on register operation. The registers are inhibited from any
modification. If register contents are modified in any way, kernel operation cannot be guaranteed.
T able   6-3. Limitations on Register Operation
Register Name
User Interrupt Stack Pointer
UART1 Transmit/Receive Mode Register
UART1 Transmit/Receive Control Register 0
UART1 Transmit/Receive Control Register 1
UART1 Interrupt Control Register 0
UART Transmit/Receive Control Register 2
UART1 Transmit Buffer Register
UART1 Receive Buffer Register
Port 6 and Port 6 DDR
Restriction
Range 0B80H – 0BFFH is used by the kernel
Do not change
Do not change
Do not change bits 0 and 2
Do not write to this register
Do not read this register
To prevent changes on P6_4 data and direction,
use read-modify-write only instructions (BSET,
BCLR, AND, OR, etc)
SKP16C26A User’s Manual Rev. 1.0
11 / 21
June 2004
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