em6522 EM Microelectronic, em6522 Datasheet - Page 45

• Manufacturer Part Number: em6522
• Description: Mfp Version Of Em6622 Ultra Low Power Microcontroller With 4x32 Lcd Driver
• Manufacturer: EM Microelectronic

12 Strobe Output
The Strobe output is used to indicate either the EM6522 reset condition, a write operation on port B (WritePB)
or the sleep mode. The selection is done in register RegLcdCntl1 . Per default, the reset condition is output on
the Strobe terminal.
For a port B write operation the strobe signal goes high for half a system clock period. Data can be latched on
the falling edge of the strobe signal. This function is used to indicate when data on port B output terminals is
changing.
The reset signal on the Strobe output is a copy of the internal CPU reset signal. The Strobe pin remains active
high as long as the CPU gets the reset.
Both the reset condition and the port B write operation can be output simultaneously on the Strobe pin.
The strobe output select latches are reset by initial power on reset only.
Table 11.1.1. Strobe Output Selection
12.1 Strobe Register
Table 12.1.1 Register RegLCDCntl1
Copyright © 2005, EM Microelectronic-Marin SA
StrobeOutSel1
The CKTripSel1, CKTripSel0 values are reset with every system reset.
Bit
3
2
1
0
0
0
1
1
R
StrobeOutSel1
StrobeOutSel0
CkTripSel1
CkTripSel0
StrobeOutSel0
Name
0
1
0
1
power on
System Reset
value
Terminal
WritePB
WritePB
System
Output
Strobe
0
0
0
0
Reset
Sleep
and
R/W
R/W
R/W
R/W
R/W
Figure 33 . Strobe Output
45
StrobeOutSel0
Reset
Reset, WritePB
WritePB
StrobeOutSel1
Sleep
LCD multiplier clock select
LCD multiplier clock select
Strobe output select
Strobe output select
Description
0
1
2
3
0
1
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EM6522
Terminal
Strobe