C509-L_97 SIEMENS [Siemens Semiconductor Group], C509-L_97 Datasheet - Page 43
C509-L_97
Manufacturer Part Number
C509-L_97
Description
8-Bit CMOS Microcontroller
Manufacturer
SIEMENS [Siemens Semiconductor Group]
Datasheet
1.C509-L_97.pdf
(290 pages)
- Current page: 43 of 290
- Download datasheet (5Mb)
Memory Organization
C509-L
As long as bit RMAP is set, mapped special function registers can be accessed. This bit is not
cleared by hardware automatically. Thus, when non-mapped/mapped registers are to be accessed,
the bit RMAP must be cleared/set by software, respectively each.
There are also 128 directly addressable bits available within each SFR area (standard and mapped
SFR area). All SFRs with addresses where address bits 0-2 are 0 (e.g. 80 H , 88 H , 90 H , 98 H , …,
F8 H , FF H ) are bitaddressable.
The 103 special function register (SFR) include pointers and registers that provide an interface
between the CPU and the other on-chip peripherals. The SFRs of the C509-L are listed in table 3-4
and table 3-5. In table 3-4 they are organized in groups which refer to the functional blocks of the
C509-L. Table 3-5 illustrates the contents of the SFRs in numeric order of their addresses.
Semiconductor Group
3-18
1997-10-01
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