C509-L_97 SIEMENS [Siemens Semiconductor Group], C509-L_97 Datasheet - Page 26

• Manufacturer Part Number: C509-L_97
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

3
The C509-L CPU manipulates data and operands in the following five address spaces:
Figure 3-1 illustrates the memory address spaces of the C509-L.
Figure 3-1
C509-L Memory Map
The internal XRAM data memory overlaps with the external data memory in the address range from
F400 H to FFFF H . In this address range, either external or internal data RAM can be used. If the
internal XRAM has been enabled, it only can be disabled by an active RESET or HWPD signal.
The internal Boot ROM also overlaps with the external code memory in the address range from
0000 H to 01FF H . Depending on the selected operating mode (chipmode), either external code
memory or the internal Boot ROM is accessed in this address range.
Semiconductor Group
– up to 64 Kbyte of external program memory
– up to 64 Kbyte of external data memory
– 512 byte of internal Boot ROM (program memory)
– 256 bytes of internal data memory
– 3 Kbyte of internal XRAM data memory
– a 128 byte special function register area
Memory Organization
3-1
Memory Organization
1997-10-01
C509-L