C509-L_97 Datasheet, PDF (39/290 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

Memory Organization
C509-L
3.4.7.2 Control Signals of the Chipmodes
As shown in chapter 3.4.2 to 3.4.5, each chipmode uses specific read/write control signals,
Table 3-3 gives a detailed survey about each chipmode and its control signals.
Table 3-3
Usage of Control Signals in the different Chipmodes
Operating Mode
(Chipmode)
Normal Mode
XRAM Mode
Bootstrap Mode
Programming
Mode
Code Memory Control Data Memory Control
PSEN /
RDF
P3.7 / RD / P3.7 / RD / P3.6 / WR PSEN /
PSENX PSENX
RDF
0000H - –
FFFFH
–
0200H -
FFFFH
–
0200H -
F3FFH
–
0200H -
F3FFH
XMAP0=1 : XMAP0=1 : –
0000H - 0000H -
FFFFH
FFFFH
XMAP0=0 : XMAP0=0 :
0000H -
F3FFH
0000H -
F3FFH
–
–
0000H -
FFFFH
0000H - 0000H - –
F3FFH
F3FFH
–
–
0000H -
FFFFH
P6.3 /
WRF
–
–
–
0000H -
FFFFH
Semiconductor Group
3-14
1997-10-01