C541U Datasheet, PDF (13/63 Pages) Siemens Semiconductor Group – 8 BIT CMOS MICROCONTROLLER

C541U
Memory Organization
The C541U CPU manipulates operands in the following four address spaces:
– 8KByte on-chip OTP program memory
– Totally up to 64 Kbyte internal/external program memory
– up to 64 Kbyte of external data memory
– 256 bytes of internal data memory
– a 128 byte special function register area
Figure 5 illustrates the memory address spaces of the C541U.
FFFFH
FFFFH
External
External
Internal
(EA = 1)
2000H
1FFFH
External
(EA = 0)
0000H
0000H
"Code Space"
"External Data Space"
indirect
addr.
Internal
RAM
direct
addr.
FFH _{Special FFH}
Function
80H ^Register 80H
Internal
RAM
7FH
00H
"internal Data Space"
Figure 5
C541U Memory Map Memory Map
Semiconductor Group
11