参数资料
型号: SAX-XC878M-16FFI5V
厂商: INFINEON TECHNOLOGIES AG
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 24 MHz, RISC MICROCONTROLLER, PQFP64
封装: PLASTIC, TQFP-64
文件页数: 69/141页
文件大小: 2385K
代理商: SAX-XC878M-16FFI5V
XC878CLM
Functional Description
Data Sheet
26
V1.1, 2009-08
Note: The RMAP bit should be cleared/set by ANL or ORL instructions.The rest bits of
SYSCON0 should not be modified.
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 XC878 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: 04H
76543210
0
IMODE
0
1
0
RMAP
r
rw
rrr
rw
Field
Bits
Type Description
RMAP
0rw
Interrupt Node XINTR0 Enable
0
The access to the standard SFR area is
enabled
1
The access to the mapped SFR area is
enabled
1
2r
Reserved
Returns 1 if read; should be written with 1.
0
[7:5],
3,1
r
Reserved
Returns 0 if read; should be written with 0.
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