C541U_99 Datasheet, PDF (22/192 Pages) Siemens Semiconductor Group – 8-BIT CMOS MICROCONTROLLER

Memory Organization
C541U
3 Memory Organization
The C541U CPU manipulates operands in the following four address spaces:
– 8 KByte 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 3-1 illustrates the memory address spaces of the C541U.
FFFF_H
External
FFFF_H
External
Internal
(EA = 1)
2000_H
1FFF_H
External
(EA = 0)
0000_H
0000_H
Indirect
addr.
Internal
RAM
Direct
addr.
FF_{H Special} FF_H
Function
80_H ^Regs. 80_H
Internal ^7FH
RAM _00H
"Code Space"
"External Data Space"
"Internal Data Space"
Figure 3-1
C541U Memory Map
Semiconductor Group
3-1
1997-10-01