SAB-C509-LM SIEMENS [Siemens Semiconductor Group], SAB-C509-LM Datasheet - Page 29

• Manufacturer Part Number: SAB-C509-LM
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

Special Function Registers
All registers, except the program counter and the four general purpose register banks, reside in the
special function register area. Several special function registers of the C509-L (CC10-17, CT1REL,
CC1EN, CAFR) are located in the mapped special function register area. For accessing the mapped
special function register area, bit RMAP in special function register SYSCON must be set. All other
special function registers are located in the standard special function register area. As long as bit
RMAP is set, mapped special function registers can be accessed. This bit is not cleared by
hardware automatically.
Special Function Register SYSCON (Address B1 H )
Bit
RMAP
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 4
and table 5. In table 4 they are organized in groups which refer to the functional blocks of the C509-
L. Table 5 illustrates the contents of the SFRs in numeric order of their addresses. The most right
column of table 5 indicates if an SFR is accessed with a mapped procedure controlled by either
RMAP or PDIR.
Semiconductor Group
Bit No. MSB
B1 H
CLKP PMOD
7
Function
Special function register map bit
RMAP = 0 : The access to the non-mapped (standard) special function
RMAP = 1 : The access to the mapped special function register area is
6
5
1
register area is enabled (reset value).
enabled.
RMAP
4
28
3
–
2
–
XMAP1
1
Reset Value : 1010XX01 B
XMAP0
LSB
0
SYSCON
C509-L