PEB2045-N SIEMENS [Siemens Semiconductor Group], PEB2045-N Datasheet - Page 21

• Manufacturer Part Number: PEB2045-N
• Description: Memory Time Switch CMOS (MTSC)
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

It is possible to read or write the direct access registers (i.e. the mode or status register) while an
indirect access is in progress. Thus the status register may be read in the time intervals that
separate the three sequential indirect access instructions. Also, the current indirect access may be
aborted by setting the MOD:RI.
Figure 13
Timing Diagrams for IAR
Semiconductor Group
a) Write IAR
WR
RD
STA:Z
b) Read IAR
WR
RD
STA:Z
Write
Control
Byte
Write
Data
Byte
< t 900 ns
_
Write
Address
Byte
21
t 900 ns
<
_
t
<
_
900 ns
PEB 2045
PEF 2045
ITD03660
ITD03661